7. Side Semiplank Crunch
Targets butt, legs, abs, and arms
Holding a dumbbell in right hand, balance with left palm on step and left knee on ground, right leg extending behind you, toes touching ground; extend right arm forward at shoulder level, palm facing left.
Bring right elbow and right knee in toward each other. Extend arm and leg (don’t touch toes on ground) and repeat.
Do 10 reps; switch sides and repeat.