Add Yahoo as a preferred source to see more of our stories on Google. Your favorite ab-building machine at the gym may be causing you more harm than good. That's right—we're talking about the torso ...
13don MSN
If You’re Not Training Your Core Like This, You Might Be Missing Out on Serious Strength Gains
Psst: it's not another plank.
According to experts, it takes just four core workouts to absolutely rip your top half to shreds, so you can get stronger.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results