Lie facedown on the mat with legs extended straight and arms down at sides, palms down. Contract glutes and lower back ...

Stability Ball Plank Roll-outs (3 sets, 10 reps) Bicycle Crunches (3 sets of 15 reps per side) Mountain Climbers (3 sets of 20 reps per side) 1. Stability Ball Plank Roll-outs This exercise ...