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The invention relates to a fitness apparatus for improving the health of the human body by a combination of physical exercise and alternating pressure applied to the body. The fitness device comprises a housing forming a pressure chamber. The housing is adapted to contain a training pressure. The tr

The invention relates to a fitness apparatus for improving the health of the human body by a combination of physical exercise and alternating pressure applied to the body. The fitness device comprises a housing forming a pressure chamber. The housing is adapted to contain a training pressure. The training pressure is different from the ambient pressure on the outside of the housing. The housing comprises a sealable opening adapted to sealingly receive said person's waist. Within the pressure chamber, an exercise device is arranged having a seat for taking off the weight off the person's legs, a pair of movable actuation surfaces where exercise work can be introduced from the person's legs into the exercise device, and a resistance means connected to the actuation surfaces and adapted to absorb the exercise work. The actuation surfaces and the seat may be arranged to be movably adjustable relative to each other and to the opening. Further, the housing may be vertically divided into at least a first and a second part which may be slidingly separated for easier access.

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What is claimed is: 1. A fitness device for physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure which differs from ambient pressure on an outside of said housing, said housing comprising a sea

What is claimed is: 1. A fitness device for physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure which differs from ambient pressure on an outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight of said person's legs, an actuation device having a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said actuation device and said seat are arranged to be movably adjustable relative to each other and to said opening and said actuation device is adjustable along a first linear path, said seat is adjustable along a second linear path, and said first linear path is inclined with respect to said second linear path by an angle of at least 10 degrees and at most 15 degrees, and an adjustment drive system which generates an adjustment force acting on at least one of said seat and said pair of actuation surfaces and is adapted to move said at least one of said seat and said pair of actuation surfaces wherein the adjustment drive system comprises at least a first electric motor for moving said pair of actuation surfaces. 2. The fitness device of claim 1, wherein said first linear path is less inclined with respect to a horizontal direction than said second linear path. 3. The fitness device of claim 2, wherein said first linear path is inclined with respect to the horizontal direction at an angle between 65 and 75 degrees. 4. The fitness device of claim 2, wherein said second linear path is inclined with respect to the horizontal direction at an angle between 80 and 90 degrees. 5. The fitness device of claim 1, wherein said adjustment drive system further comprises a second electric motor, said first electric motor being operatively disposed between said actuation device and said housing, and said second electric motor being operatively disposed between said seat and said housing. 6. The fitness device of claim 1, wherein said adjustment drive system is received within said housing. 7. A fitness device for physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure which differs from ambient pressure on an outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight of said person's legs, an actuation device having a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said actuation device and said seat are arranged to be movably adjustable relative to each other and to said opening and said actuation device is adjustable along a first linear path, said seat is adjustable along a second linear path, and said first linear path is inclined with respect to said second linear path by an angle of at least 10 degrees and at most 15 degrees, and wherein said fitness device comprises a support structure supporting said exercise device and said seat, said support structure being formed by a tubular frame which is arranged in a back part of said pressure chamber. 8. The fitness device of claim 7, wherein a height of said support structure in a vertical direction is larger than its width in a horizontal direction. 9. The fitness device of claim 7, wherein at least one of said first and second linear path is formed by a sliding surface of a part of said support structure. 10. The fitness device of claim 7, wherein the greatest vertical height of said pressure chamber is larger than the greatest horizontal length of the pressure chamber. 11. The fitness device of claim 7, wherein said housing comprises a first part and a second part, said first part being arranged horizontally movable with respect to said second part from a training position, in which said first part is in air pressure-tight engagement with said second part, into an access position, in which said first part and said second part are spaced apart from each other to form an access opening. 12. The fitness device of claim 11, wherein, in said access position, said housing is split into two halves, a first half formed by said first part, a second half formed by said second part. 13. A fitness device for the physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure, said training pressure being different from the ambient pressure on the outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight of said person's legs, an actuation device having a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said actuation device and said seat are arranged to be movably adjustable relative to each other and to said opening, wherein said housing comprises a first part and a second part, said first part being arranged horizontally movable with respect to said second part from a training position in which said first part is in air pressure-tight engagement with said second part, into an access position in which said first part and said second part are spaced apart from each other to form an access opening, and wherein said first part is slidingly supported on a rail. 14. The fitness device of claim 11, wherein said first part is slidingly supported on a rail and said rail is directed downwards at least in an end region facing away from said second part. 15. The fitness device of claim 11, wherein said fitness device comprises an access drive system, generating a moving force acting on said first and second part and adapted to support transfer of said first and second part from said training position into said access position. 16. The fitness device of claim 15, wherein, in said training position, said access drive system is adapted to generate a sealing force, said sealing force acting to form an air-tight engagement between said first part and said second part. 17. The fitness device of claim 15, wherein said access drive system comprises at least one pressure cylinder operatively disposed between said first and said second part. 18. The fitness device of claim 11, wherein a locking device is provided, locking said first part to said second part in said training position. 19. The fitness device of claim 15, wherein said drive system is arranged within said housing. 20. The fitness device of claim 13, wherein said rail is arranged within said housing. 21. The fitness device of claim 11, wherein at least one of said first and said second part is provided with a handle arranged in a vicinity of said access opening and in a top region of said housing. 22. The fitness device of claim 18, wherein at least one of said first and said second part is provided with a handle arranged in a vicinity of said access opening and in a top region of said housing and said locking device is operatively connected to said handle. 23. The fitness device of claim 21, wherein said handle forms a cover covering a seam between said first and said second part. 24. The fitness device of claim 11, wherein said first and said second part are each formed from an integral shell made of synthetics. 25. The fitness device of claim 11, wherein said second part comprises a base plate, said base plate extending underneath said first part. 26. The fitness device of claim 11, wherein, in said training position, said first and said second part are engaged by a key and slot seal. 27. The fitness device of claim 7, wherein said fitness device comprises a pressure pump adapted to generate a differential pressure between +60 mbar and −60 mbar with respect to an ambient pressure outside of said housing. 28. A fitness apparatus for the physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure, said training pressure being different from the ambient pressure on the outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight off said person's legs, a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said housing is vertically divided into at least a first part and a second part, said first part being connected to said second part via a sliding mechanism and being arranged horizontally movable with respect to said second part from a training position, in which said first part is in pressure-tight engagement with said second part, into an access position, in which said first part and said second part are spaced apart from each other to form an access opening. 29. A fitness apparatus for the physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure, said training pressure being different from the ambient pressure on the outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, and a first part and a second part, said first part being arranged horizontally movable with respect to said second part from a training position, in which said first part is in air pressure-tight engagement with said second part, into an access position, in which said first part and second part are spaced apart from each other to form an access opening, wherein said first part is slidingly supported on a rail, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight of said person's′ legs, an actuation device having a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said actuation device and said seat are arranged to be movably adjustable relative to each other and to said opening. 30. A fitness apparatus for the physical training of a person, said fitness device comprising: a housing forming a pressure chamber, said housing being adapted to contain a training pressure, said training pressure being different from the ambient pressure on the outside of said housing, said housing comprising a sealable opening adapted to sealingly receive said person's waist, and a first part and a second part, said first part being arranged horizontally movable with respect to said second part from a training position, in which said first part is in air pressure-tight engagement with said second part, into an access position, in which said first part and second part are spaced apart from each other to form an access opening, an access drive system generating a moving force acting on said first and second part and adapted to support transfer of said first and second part from said training position into said access position, and a locking device is provided, locking said first to said second part in said training position, said locking device being held in a locking position by one of a pressure and an electromagnetic force generated by said drive system, an exercise device arranged within said pressure chamber, said exercise device having a seat for taking off the weight of said person's legs, an actuation device having a pair of movable actuation surfaces where exercise work can be introduced from said person's legs into said exercise device, and a resistance means connected to said actuation surfaces and adapted to absorb said exercise work, wherein said actuation device and said seat are arranged to be movably adjustable relative to each other and to said opening.