Abstract: The invention relates to a sporting and exercising unit which includes a foot receiving member and a spring member attached to and disposed at the bottom of the foot receiving member. The spring member includes a spring-leaf-like portion which forms a closed loop and is shaped to permit backward and forward rocking of the user. The spring member may be oval shaped, circle shaped, or in the shape of a parallelogram. The foot receiving member is adjustable to receive different sizes of feet and legs by having opening flaps extending therealong and openings for receiving laces in the flaps whereby to adjust the sizes of these portions by adjusting the sizes of the openings and to adjustably close the openings.