The Ultimate Arm and Ab Exercise You're Not Doing Enough Of
Instantly Feel the Burn With This Crazy-Effective Plank Variation - Tired of lifting weights or doing push-ups? Then give the Dolphin Dive a try. It'll tone your shoulders, upper arms, and back, and it will also increase flexibility in your hamstrings — using just your body weight.
Abs: Mountain Climber with Hands on Swiss Ball || The benefit: It's one of the simplest, yet most effective ways to tighten your tummy. In fact, you'll barely have to move a muscle.

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