When it comes to a solid abs workout, simplicity can go a long way. With just a mat, your body, and a can-do attitude, you can fire up your midsection, working practically every muscle in your ...

Lift your legs off the ground slightly and alternately scissor kick them up and down in a small range of motion. For one set, either count your kicks (i.e., do a set of 20 flutter kicks), or perform ...