result in emulsification of the hydraulic fluid particularly when the machine is operated at a high cycle frequency the housing of hydraulic cylinders 190 and 240 can be steel tubing or extruded aluminum with external fins to increase the surface area for heat dissipation and a hard anodized inside diameter for wear resistance and durability the piston seal is preferably an u cup seal heads 246 and 248 contain a rod bearing a rod wiper and a rod seal at each rod port by using ball joints for all tie rods sintered bronze bushings and an hydraulic cylinder for the resistance means the preferred embodiment of the exercising machine of this invention is whisper quiet when in use and as such can be enjoyed in an user 39 s apartment without disturbing residents in adjacent apartments because the whisper quiet nature of the exercising machine the user can listen to television or stereo simultaneously while exercising without having to turn the sound up to compensate for noise produced by the machine whereas exercising machines using chains gears or weights are relatively noisy when used and relatively messy because of the lubricating grease the exercising machine of this invention can be safely used and housed in the user 39 s living quarters rather than the garage basement or gymnasium while the preferred embodiments of the present invention have been described it should be understood that various changes adaptations and modifications may be made thereto without departing from the spirit of the invention and the scope of the appended claims it should be understood therefore that the invention is not to be limited to minor details of the illustrated invention shown in the figures.