Here on the Tom’s Guide fitness desk, we love nothing more than an exercise challenge and next on my list was this ab exercise you’ve probably never heard of — butterfly crunches (also known as frog crunches).
Sounds interesting, I thought, as I unrolled my yoga mat on day one of this challenge. A week later, I’ve learned a lot about this interesting move and its benefits when it comes to sculpting strong abdominal muscles.
