Abstract: A step adjuster for an elliptical exercise device includes two assembly frames that are each pivotally connected with a sector gear and a movable sector disc for mutual movement. An eccentric portion of the sector gear and the movable sector disc are connected to crank blocks in slide grooves of the assembly frames by means of adjusting arms, and pedal cranks are respectively connected between the crank blocks and pedals. The sector gear has teeth engaging a worm gear of a hand crank, and moves to synchronously adjust the distance between the pedals and the connect rods.

Abstract: A stationary bike includes a first shaft, a second shaft and third shaft, two pedal rods fixed on the first shaft, a first transmitting wheel and a flywheel fixed on the first shaft, a second, a third, a fourth and a fifth transmitting wheel fixed on the second shaft. The second and the third one are fixed thereon with a one-way bearing, and the fourth and the fifth transmitting wheel are fixed firmly thereon, with the fifth one connected with the flywheel with a moving member. A sixth and a seventh transmitting wheel are fixed on the third shaft, with the sixth one connected with the third one with a moving member and with a one-way bearing. The seventh and the fourth transmitting wheel engage with each other to rotate in the opposite direction Then the flywheel a always rotates clockwise in spite of clockwise or counterclockwise rotation of the pedal rods. And a resisting device with a generator may be affixed beside the flywheel to generate power to supply to the stationary bike.

Abstract: A measuring method for anaerobic threshold (AT) includes a plurality of steps carried out by a data putting-in unit, a load class selecting unit, a detecting and calculating unit and a display unit. The steps includes putting in age, weight and gender of a user wearing a heart beat emitter and using an exercise device (for example, a treadmill) mounted with those units, and selecting a load class to take exercise on the exercise device. Then those units detect, measure and record heart beat cycle and calculate heart beat cycle difference detected for every set period of time. Then AT limit point is found out and displayed on the display unit for reference for the user to control exercise load and time.

Abstract: A resistance control device for a training appliance includes a resist wheel fixed on the training appliance, and a magnet base adjustable in the distance between the resist wheel and having a plurality of magnets. A right end of the magnet base is pivotally connected to a fix base fixed with the training appliance, and a left end remaining free to move up and down and having a lateral rod. Further, an eccentric block is located at one side of the lateral rod, having a center shaft hole for fixing a shaft rotated by a drive source and a long curved slot for the lateral rod to fit in and move along. The distance between every point of the slot and the center shaft hole is decided by a calculation formula F=Ca.times.S all different.