2007-02-20 07:23:39 · 5 answers · asked by chezplz 2 in Health ➔ Diet & Fitness
both if you're doing them correctly - also don't do them too fast - and be sure you don't strain your neck or hurt your back - you should 'feel' the burn.. but only in your middle!
2007-02-20 07:28:46 · answer #1 · answered by thenakats 4 · 1⤊ 0⤋
Both. Coming up the muscle contracts to pull you up - as you go down the muscle lengthens slowly in a controlled way. Both actions work the muscle.
2007-02-20 15:32:22 · answer #2 · answered by coffee 5 · 0⤊ 0⤋
Both. The trick is to contract the muscles when going up. Many sources agree that crunches are not as effective as once thought.http://www.healthatoz.com/healthatoz/Atoz/common/standard/transform.jsp?requestURI=/healthatoz/Atoz/hl/fit/star/alert05222001.jsp This article is good. It gives alternatives that work. Good luck and have a healthy year.
2007-02-20 15:31:41 · answer #3 · answered by firestarter 6 · 0⤊ 0⤋
You gain muscle when the muscles repair themselves later. You break the muscle down anytime there is resistance.
2007-02-20 15:31:22 · answer #4 · answered by Blunt Honesty 7 · 0⤊ 0⤋
go slow, and you should feel it on both.
2007-02-20 15:35:09 · answer #5 · answered by eribear21 1 · 0⤊ 0⤋