This variation on the classic crunch adds more focus to the obliques through a twisting motion and challenges you to 'smash' your elbow into your knees.

Add Yahoo as a preferred source to see more of our stories on Google. Protein powder became a thing in my life not because I was working out a ton (nope!) but because I was bored at an old job and ...

Protein powder became a thing in my life not because I was working out a ton (nope!) but because I was bored at an old job and snacking too much. A quick shake or a scoop of protein dropped into a cup ...