Crunches vs. planks: Which is better?
https://youtu.be/NmeKNM7YFeA Which workout is better - crunches or planks? When we’re talking about developing a lean, rock-solid core, some exercises are better than others. The truth is, the key to a defined midsection is always going to come down to diet. We’ve all got a 6-pack, but there’s layers of…