Add Yahoo as a preferred source to see more of our stories on Google. The cost of gym memberships and the hassle of commuting can make staying fit feel like a chore. It's a common discussion on ...

What's more? It can do so with zero equipment (nope, not even a pair of wine bottles), which makes it a hero of at-home workouts. So, if you're looking for ways to make your obliques quake so good in ...