ways to strengthen abs? the best way to strenthen them for crunches at home w/o machine?
hi, does anyone know the best way to do more crunches. i dont have a great amount of abs i can do in a row. im not fat or anything im skinny, i just want to make them stronger & make it so i can do more crunches. Suggestions please! thanks 
By: katie d
About the Author:
By: katie d
About the Author:
