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An adjustable dumbbell system may include a handle assembly, at least one weight, at least one sensor, and a computing device. The at least one weight may be selectively fixedly connectable to the handle assembly. The least one sensor may be positioned on the handle assembly. The at least one sensor

An adjustable dumbbell system may include a handle assembly, at least one weight, at least one sensor, and a computing device. The at least one weight may be selectively fixedly connectable to the handle assembly. The least one sensor may be positioned on the handle assembly. The at least one sensor may be configured to detect a handle assembly attribute indicative of whether the at least one weight is fixedly connected to the handle assembly. The computing device may be in communication with the at least one sensor and may be configured to receive information regarding the handle assembly attribute from the at least one sensor.

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1. An adjustable dumbbell system, comprising: a handle assembly;at least one weight selectively fixedly connectable to the handle assembly;at least one sensor positioned on the handle assembly, the at least one sensor configured to detect a handle assembly attribute indicative of whether the at leas

1. An adjustable dumbbell system, comprising: a handle assembly;at least one weight selectively fixedly connectable to the handle assembly;at least one sensor positioned on the handle assembly, the at least one sensor configured to detect a handle assembly attribute indicative of whether the at least one weight is fixedly connected to the handle assembly; anda computing device in communication with the at least one sensor and configured to receive information regarding the handle assembly attribute from the at least one sensor, wherein:the at least one weight comprises a plurality of weights and the handle assembly includes a disc that is rotatable into a set of discrete rotational positions, each rotational position corresponding to a different combination of the plurality of weights fixedly connected to the handle assembly;the at least one sensor is configured to detect the rotational position of the disc, and the computing device is configured to determine which of the plurality of weights are fixedly connected to the handle assembly based on the rotational position detected by the at least one sensor; andthe at least one sensor includes at least one of the following: an optical sensor, a reflective sensor, a mechanical sensor, an inductive sensor, a capacitive sensor, a potentiometer, an accelerometer, or a magnetometer. 2. The adjustable dumbbell system of claim 1, wherein the at least one sensor is positioned on the handle assembly so as to remain in a fixed position relative to the rotation of the disc. 3. The adjustable dumbbell system of claim 1, further comprising: a rotational position encoding feature arranged on the disc so as to encode each of a plurality of disc sectors with a unique binary number, each disc sector corresponding to one of the discrete rotational positions of the disc; andthe at least one sensor comprises a plurality of sensors configured to cooperate with the rotational position encoding feature to detect a different one of the unique binary numbers when the disc is in each of the discrete rotational positions;wherein the computing device is configured to determine which of the plurality of weights are fixedly connected to the handle assembly based on the unique binary number detected by the plurality of sensors. 4. The adjustable dumbbell system of claim 3, wherein: the rotational position encoding feature encodes each disc sector with a unique binary number by encoding each of a plurality of sector subdivisions with either a first binary digit or a second binary digit; andthe plurality of sensors are configured to sense the unique binary number by sensing each of the sector subdivision encodings, each sensor of the plurality of sensors arranged to sense one of the sector subdivisions encodings when the disc is in a particular one of the discrete rotational positions. 5. The adjustable dumbbell system of claim 4, wherein: the rotational position encoding feature includes a plurality of tabs arranged around a perimeter of the disc and extending axially outward from the perimeter, a presence of one of the plurality of tabs in a particular sector subdivision corresponding to that particular sector subdivision being encoded with the first binary digit, and an absence of one of the plurality of tabs in a sector subdivision corresponding to that particular sector subdivision being encoded with the second binary digit; andthe plurality of sensors include optical interrupt sensors, each optical interrupt sensor including a transmitter and a receiver disposed on opposing sides of the tabs, the transmitter configured to emit a light beam toward the opposing receiver, each optical interrupt sensor configured to detect that a particular sector subdivision is encoded with the first binary digit by sensing that the light beam emitted by the transmitter is blocked by one of the plurality tabs so as to prevent reception of the light beam by the opposing receiver, and configured to detect that a particular sector subdivision is encoded with the second binary digit by sensing that the light beam emitted by the transmitter is not blocked by one of the plurality of tabs so as to be received by the opposing receiver. 6. The adjustable dumbbell system of claim 4, wherein: the rotational position encoding feature includes a plurality of surface features disposed on a surface of the disc, a presence of a surface feature in a particular sector subdivision corresponding to that particular sector subdivision being encoded with the first binary digit, and an absence of a surface feature in a sector subdivision corresponding to that particular sector subdivision being encoded with the second binary digit; andthe plurality of sensors include mechanical sensors, each mechanical sensor movable into a unactuated position by the action of a sensor biasing mechanism when a sensor contact is engaged with one of the surface features, and movable into an actuated position by an application of a mechanical force by the surface of the disc that acts against the sensor biasing mechanism when the sensor contact is not engaged with one of the surface features, each mechanical sensor configured to detect that a particular sector subdivision is encoded with the first binary digit by sensing that the mechanical sensor is in the unactuated position and configured to detect that a particular sector subdivision is encoded with the second binary digit by sensing that the mechanical sensor is in the unactuated position. 7. The adjustable dumbbell system of claim 1, wherein: the at least one sensor is configured to detect the rotational position of the disc by detecting a sensible parameter including a substantially continuous range of possible values, the substantially continuous range of values divided into at least one sub-range, each of the at least one sub-range associated with a particular number of the plurality of weights; andthe computing device is configured to determine which of the plurality of weights are fixedly connected to the handle assembly by determining which sub-range of the at least one sub-range is detected. 8. The adjustable dumbbell system of claim 1, wherein: the disc includes a contoured perimeter such that points along at least a portion of the perimeter are disposed at a different distance from a center of the disc; andthe at least one sensor includes a potentiometer operatively associated with the contoured perimeter to detect the rotational position of the disc. 9. The adjustable dumbbell system of claim 1, wherein: the disc includes a concentric ring of material positioned on a surface of the disc, the material including an electrical property that has a different magnitude at each angular position along the ring;the at least one sensor includes an electrical sensing portion adjacent to the ring of material, the electrical sensing portion configured to detect the magnitude of the electrical property of the ring of material as the disc rotates; andthe sensor detects the rotational position of the disc based on the detected magnitude of the electrical property. 10. The adjustable dumbbell system of claim 1, further comprising: a magnet joined to the handle assembly, the magnet configured to change a direction of the magnetic field as the disc rotates;the at least one sensor includes a magnetic sensing portion adjacent to the magnet, the magnetic sensing portion configured to detect the direction of the magnetic field of the magnet; andthe sensor detects the rotational position of the disc based on the detected direction of the magnetic field of the magnet. 11. The adjustable dumbbell system of claim 1, further comprising: at least one separator disc operatively associated with the disc so as rotate with the disc, the separator disc including a number of cut-out sections arranged within an outer ring portion of the separator disc;a plurality of selector discs operatively associated with the disc so as rotate with the disc, each selector disc including engagement features that retain a particular weight on the handle assembly in certain rotational positions of the selector disc; anda plurality of reflective optical sensors positioned on the handle assembly, the plurality of reflective optical sensors configured to sense a unique pattern of cut-out sections and engagement features formed at a position proximate to the sensors;wherein the computing device is configured to determine which weights are fixedly connected with the handle assembly based on the unique pattern of cut-out sections and engagement features detected by the plurality of reflective optical sensors. 12. The adjustable dumbbell system of claim 1, wherein: the at least one sensor includes an accelerometer that rotates with the disc, the accelerometer configured to sense a change in a gravity vector as the disc is rotated between the discrete rotational positions; andthe computing device is configured to receive change in gravity vector information from the accelerometer and to determine which weights are fixedly connected to the handle assembly based on the gravity vector information. 13. The adjustable dumbbell system of claim 1, wherein: at least one of the at least one weight includes a selection assembly, the selection assembly including a selection member movable between a selected position where said at least one of the at least one weight is fixedly connected to the handle assembly and an unselected position where said at least one of the at least one weight is not fixedly connected to the handle assembly; andthe at least one sensor is configured to detect if said at least one of the at least one weight is fixedly connected to the handle assembly by sensing if the selection member is in the selected position. 14. The adjustable dumbbell system of claim 1, wherein the handle assembly includes a handle operatively associated with the disc so as to rotate with the disc. 15. A sensing mechanism for an adjustable dumbbell system, comprising: at least one sensor connected to a handle assembly of an adjustable dumbbell so as to remain in a fixed position relative to a rotation of an indicator member of the handle assembly, the at least one sensor configured to detect the rotational position of the indicator member;a computing device configured to determine which of a plurality of weights is engaged by the handle assembly based on the rotational position detected by the at least one sensor;a rotational position encoding feature arranged on the indicator member so as to encode each of a plurality of indicator member sectors with a unique binary number, each sector corresponding to one of a plurality of discrete rotational positions of the indicator member and each rotational position corresponding to selection of a different combination of weights; andthe at least one sensor comprising a plurality of sensors configured to cooperate with the rotational position encoding feature to detect a different one of the unique binary numbers when the indicator member is in each of the discrete rotational positions, the plurality of sensors including at least one of the following: an optical sensor, a reflective sensor, a mechanical sensor, an inductive sensor, a capacitive sensor, a potentiometer, an accelerometer, or a magnetometer;wherein the computing device is configured to determine which of the plurality of weights are fixedly connected to the handle assembly based on the unique binary number detected by the plurality of sensors. 16. The sensing mechanism of claim 15, wherein: the rotational position encoding feature encodes each sector with a unique binary number by encoding each of a plurality of sector subdivisions with either a first binary digit or a second binary digit; andthe plurality of sensors are configured to sense the unique binary number by sensing each of the sector subdivision encodings, each sensor of the plurality of sensors arranged to sense one of the sector subdivisions encodings when the indicator member is in a particular one of the discrete rotational positions. 17. The sensing mechanism of claim 16, wherein: the indicator member is a disc, and the rotational position encoding feature includes a plurality of tabs arranged around a perimeter of the disc and extending axially outward from the perimeter, a presence of one of the plurality of tabs in a particular sector subdivision corresponding to that particular sector subdivision being encoded with the first binary digit, and an absence of one of the plurality of tabs in a sector subdivision corresponding to that particular sector subdivision being encoded with the second binary digit; andthe plurality of sensors include optical interrupt sensors, each optical interrupt sensor including a transmitter and a receiver disposed on opposing sides of the tabs, the transmitter configured to emit a light beam toward the opposing receiver, and each optical interrupt sensor configured to detect that a particular sector subdivision is encoded with the first binary digit by sensing that the light beam emitted by the transmitter is blocked by one of the plurality of tabs so as to prevent reception of the light beam by the opposing receiver, and configured to detect that a particular sector subdivision is encoded with the second binary digit by sensing that the light beam emitted by the transmitter is not blocked by one of the plurality of tabs so as to be received by the opposing receiver. 18. The sensing mechanism of claim 16, wherein: the indicator member is a disc, and the rotational position encoding feature includes a plurality of surface features disposed on a surface of the disc, a presence of a surface feature in a particular sector subdivision corresponding to that particular sector subdivision being encoded with the first binary digit, and an absence of a surface feature in a sector subdivision corresponding to that particular sector subdivision being encoded with the second binary digit; andthe plurality of sensors include mechanical sensors, each mechanical sensor movable into a unactuated position by the action of a sensor biasing mechanism when a sensor contact is engaged with one of the surface features and movable into an actuated position by an application of a mechanical force by the surface of the disc that acts against the sensor biasing mechanism when the sensor contact is not engaged with one of the surface features, and each mechanical sensor configured to detect that a particular sector subdivision is encoded with the first binary digit by sensing that the mechanical sensor is in the unactuated position and configured to detect that a particular sector subdivision is encoded with the second binary digit by sensing that the mechanical sensor is in the unactuated position. 19. A sensing mechanism for an adjustable dumbbell system, comprising: at least one sensor connected to a handle assembly of an adjustable dumbbell so as to remain in a fixed position relative to a rotation of a disc of the handle assembly, the at least one sensor configured to detect the rotational position of the disc;a computing device configured to determine which of at least one weight is engaged by the handle assembly based on the rotational position detected by the at least one sensor, wherein:the disc includes a contoured perimeter such that points along at least a portion of the perimeter are disposed at a different distance from a center of the disc; andthe at least one sensor includes a potentiometer operatively associated with the contoured perimeter to detect the rotational position of the disc. 20. A sensing mechanism for an adjustable dumbbell system, comprising: at least one sensor connected to a handle assembly of an adjustable dumbbell so as to remain in a fixed position relative to a rotation of a disc of the handle assembly, the at least one sensor configured to detect the rotational position of the disc;a computing device configured to determine which of at least one weight is engaged by the handle assembly based on the rotational position detected by the at least one sensor, wherein:the disc includes a concentric ring of material positioned on a surface of the disc, the material including an electrical property that has a different magnitude at each angular position along the ring;the at least one sensor includes an electrical sensing portion adjacent to the ring of material, the electrical sensing portion configured to detect the magnitude of the electrical property of the ring of material as the disc rotates; andthe sensor detects the rotational position of the disc based on the detected magnitude of the electrical property. 21. A sensing mechanism for an adjustable dumbbell system, comprising: at least one sensor connected to a handle assembly of an adjustable dumbbell so as to remain in a fixed position relative to a rotation of a disc of the handle assembly, the at least one sensor configured to detect the rotational position of the disc;a computing device configured to determine which of at least one weight is engaged by the handle assembly based on the rotational position detected by the at least one sensor;a magnet joined to the handle assembly, the magnet configured to change the direction of the magnetic field as the disc rotates;the at least one sensor includes a magnetic sensing portion adjacent to the magnet, the magnetic sensing portion configured to detect the direction of the magnetic field of the magnet; andthe sensor detects the rotational position of the disc based on the detected direction of the magnetic field of the magnet. 22. The sensing mechanism of claim 15, wherein the handle assembly includes a handle operatively associated with the indicator member so as to rotate with the indicator member. 23. The sensing mechanism of claim 19, wherein the handle assembly includes a handle operatively associated with the disc so as to rotate with the disc. 24. The sensing mechanism of claim 20, wherein the handle assembly includes a handle operatively associated with the disc so as to rotate with the disc. 25. The sensing mechanism of claim 21, wherein the handle assembly includes a handle operatively associated with the disc so as to rotate with the disc.