The Key to a Flat Stomach

According to Michaels, this workout strengthens your core, as well as your chest, shoulders, lats, triceps, and quads. 

Burpees will also get your heart beating since they include intense plyometric action.

Phelps recommends adding a medical ball to your burpee to improve the intensity and raise your metabolism, all while sculpting a sleek set of six-pack abs.

According to DiVecchio, the Russian twist is a core workout that enhances oblique strength and definition

The motion requires twisting your torso from side to side while keeping a sit-up posture with your feet off the ground, which is usually done with a medicine ball or plate.

According to Jill Penfold, a Los Angeles-based personal trainer, running on an inclination rather than a level surface may boost overall calorie burn by as much as 50%.

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