There is an excellent Ab crunch stand in my Gym. It has two arm rests with handles. It has a foot rest on each side to stand on to hoist oneself up to the arm rest. As a back rest there is a thick rubber balloon. The idea is to raise your legs and work the lower abs. This is a very large stand and wont fit in most houses.
My version is some thing that can fit in the door way of any house. It works on the principle of the pull up bar that has one side that screws out to fit tightly in the door way. My device would need two more rods one under each side arm rest as support. These rods would help to stabilize the motion by using the leg raise motion and hence pressure.
For the back rest we would continue to use a smaller rubber inflatable ball.
Idea for any fitness equipment manufacturer like http://www.reebok.com or http://www.nike.com
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