Broken Bicycle
The Broken Bicycle is a variation of Freddie Mercurys. Lay on six with leg straight out and hands behind head. Lift torso like doing a crunch while bringing one knee to meet elbows with the other leg remaining straight. Return to original position and repeat with opposite leg. It is a four count exercise with you alternating legs on each sit up. When done correctly it looks like you are riding a "broken bicycle".