"You can also utilize traditional calisthenic exercises like burpees, squat jumps ... Journal of Clinical Medicine. Jillian Michaels, health and fitness expert and creator of The Fitness App.

I tried to stay active in between babies—I’d run, road bike, and try home HIIT, P90X, and Jillian Michaels’ workouts ... I even asked a group of women to teach me how to use the squat rack before one ...

I lifted heavy weights, did a lot of core work to try and grow my abs muscles, and consistently tracked calories. However, I ...