Abstract: A treadmill with an adjustable cushioning mechanism configured to adjustably cushion the impact of a user exercising on the treadmill. The adjustable cushioning members allow the user to select the amount of cushioning provided by adjusting the cushioning members to individualize the amount of cushioning for a specific user as well as for a particular type of exercise. The cushioning members are positioned on opposing sides of the treadmill frame and are interconnected such that movement of one of the cushioning members results in corresponding movement of the other of the cushioning members. The cushioning members are configured to be adjusted so as to selectively position a portion of the cushioning members between the frame and the deck of the treadmill. The cushioning members may optionally be adjusted manually or mechanically.