An exercise frame made up of two upright members connected by a transverse base member and a transverse link attached to the top portion of the frame. A transverse spring-loaded grip bar is positioned at a height suitable for gripping by user's hands while the user in a lying position in front of the base member. A pair of leg supports is designed to alternately support one or the other of user's legs while the user's rests the Achilles tendon on one of two leg supports carried by the upright members above the grip bar. The user performs exercises designed to strengthen rectus abdominis without flexing user's torso.