Not much difference: The real trick is to isolate the abdominal muscles and not use arm motion for momentum to help due the exercise, either position would work. It is easier to add a rotation to the motion and work the oblique muscles with hands behind head.
Answered 3/26/2013
5.9k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question