This exercise is called the swiss ball crunch. The abdominal muscles work at 45 degrees extension, all the way to 35 degrees flexion. After 35 degrees of flexion, the hip flexors take over in flexing the body. This exercise is sure to get the abdominals chiseled.
This exercise is called the swiss ball crunch. The abdominal muscles work at 45 degrees extension, all the way to 35 degrees flexion. After 35 degrees of flexion, the hip flexors take over in flexing the body. This exercise is sure to get the abdominals chiseled.