3 Arm Positions For Your Crunchby
If you are doing more than 25 crunches in a row - STOP!
The only benefits you aregetting... the difficulty of your crunch is to change the arm position.
Here are the basic three arm positions...
Getting Fit Fast and Crunches.by
bouts conferred equal endurance benefits as exercising at a lower intensity nearly 50 times longer. In other words, by working your tail off for a few minutes, you’d receive the same physiological benefit...