An abdominal/back muscle exercise device includes a base, a knee support, and an ankle support. Additionally, the abdominal/back muscle exercise device may include a steady post. The ankle support may include a T-bar, a telescoping inner horizontal support shaft, an inner vertical support shaft and an ankle padding. The knee support may include a telescoping upright tube, a knee support inner shaft, a knee radial pivot lock bracket, a knee cushion and an upper leg support rest.