A unique abdominal bench with a pivoting torso section has a number of pivots, rods, and levers that allow the fixed seat section of the abdominal bench to remain a constant distance from the pivoting torso section during an abdominal exercise. The leg section of the abdominal bench pivots towards the...http://www.google.ca/patents/US6884203?utm_source=gb-gplus-sharePatent US6884203 - Abdominal bench with constant gap torso cushion
