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An exercise apparatus has a support frame and an exercise arm assembly pivotally linked to the support frame for swinging movement in at least one fixed arc about a first pivot axis, the exercise arm assembly including at least one rigid, elongate exercise arm. A flexible handle assembly is secured

An exercise apparatus has a support frame and an exercise arm assembly pivotally linked to the support frame for swinging movement in at least one fixed arc about a first pivot axis, the exercise arm assembly including at least one rigid, elongate exercise arm. A flexible handle assembly is secured to the exercise arm, the handle assembly having a hand grip portion for gripping by a user, and a flexible connecting portion securing the hand grip portion to the exercise arm to permit a variety of different upper body exercises to be performed by moving the hand grip portion in selected different paths as permitted by the flexible connecting portion.

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An exercise apparatus has a support frame and an exercise arm assembly pivotally linked to the support frame for swinging movement in at least one fixed arc about a first pivot axis, the exercise arm assembly including at least one rigid, elongate exercise arm. A flexible handle assembly is secured

An exercise apparatus has a support frame and an exercise arm assembly pivotally linked to the support frame for swinging movement in at least one fixed arc about a first pivot axis, the exercise arm assembly including at least one rigid, elongate exercise arm. A flexible handle assembly is secured to the exercise arm, the handle assembly having a hand grip portion for gripping by a user, and a flexible connecting portion securing the hand grip portion to the exercise arm to permit a variety of different upper body exercises to be performed by moving the hand grip portion in selected different paths as permitted by the flexible connecting portion. nder unit having a piston and a cylinder, a drive for said piston/cylinder unit, a push rod directly connected with said piston/cylinder unit, and a deflection fitting with a keyhole opening, said push rod having a first end which is, at least in the case of restraint, directly connected with said belt, said first end of said push rod moving away from said cylinder on activation of said piston/cylinder unit, said push rod converting a movement brought about in said piston/cylinder unit into a displacement of said belt on activation of said drive, and said piston/cylinder unit, at an axial end remote from said push rod, having a mushroom-like projection which is arrested in said keyhole opening to fasten said piston/cylinder unit to said deflection fitting. 2. The belt tensioner system according to claim 1, wherein said keyhole opening is closed by fastening said deflection fitting. 3. A belt tensioner system according to claim 1, wherein said belt runs through said deflection fitting and extends after said deflection fitting transversely to a longitudinal extent of said cylinder. 4. A belt tensioner comprising: a belt, a piston/cylinder unit having a piston and a cylinder, said cylinder being oval in cross-section, a drive for said piston/cylinder unit, and a push rod directly connected with said piston/cylinder unit, said push rod having a first end which is, at least in the case of restraint, directly connected with said belt, said first end of said push rod moving away from said cylinder on activation of said piston/cylinder unit, and said push rod converting a movement brought about in said piston/cylinder unit into a displacement of said belt on activation of said drive. 5. A belt tensioner system comprising: a belt, at least two piston/cylinder units each having a piston and a cylinder, said cylinders being arranged adjacently and parallel to each other, a drive for said piston/cylinder units, and said piston/cylinder units having associated push rods which are coupled with each other, said push rods each having a first end which is, at least in the case of restraint, directly connected with said belt, said first ends of said push rods moving away in the same direction from said cylinders on activation of said piston/cylinder units, said push rods converting, on activation of said drive, a movement brought about in said piston/cylinder units into a displacement of said belt. 6. A belt tensioner comprising: a belt, a housing, a single piston/cylinder unit having a piston movable in a cylinder contained in said housing, a drive for said piston/cylinder unit, and a push rod which is directly connected with said piston/cylinder unit and, at least in the case of restraint, with said belt, said belt extending into said housing and being guided within said housing to form a loop in the shape of a "U", the loop having two legs extending from a base portion, said base portion joining said two legs together, said drive, said single piston/cylinder unit and said push rod comprising a separate, preassembled module arranged within said housing, said module having two opposite ends and being completely arranged between said two legs in said loop, said one end of said module being non-displaceably fixed and said opposite end of said module having a belt contact surface contacting a belt area defining the bottom portion of said "U", said opposite end of said module and said belt contact surface being displaced upon activation of said drive by a relative displacement between, on the one hand, the cylinder and, on the other hand, the piston and the rod in order to displace and enlarge said loop formed by said belt, said push rod consisting of an elongated section running parallel to a displacement direction and of a section adjoining an end of said elongated section on a belt side, said latter section extending transversely to said elongated section and having said curved belt contact surface.