Not exact matches
But
when it comes to training the external obliques, or the muscles at the sides of your waist, researchers agree that regular
crunches are not the best choice there is, and that's where
bicycle crunches come into play.
When you're doing something like
bicycle crunches or flutter kicks, or anything... make sure you go until you have to collapse.
When you flex and rotate like in
bicycle crunches or oblique
crunches, the obliques work at maximum capacity.