Get into a plank position. Either from your knees or toes. Start with the DB by your right hand. Reach with your left and pull the dumbbell to your left arm. Then repeat with the right.

Dumbbell Plank Pullthrough

Start on hands and knees. Extend right arm and left leg. Hold for a few seconds, then switch sides.

Bird Dog

Place hands on Bosu, shoulder-width apart. Extend legs, keeping body straight. Hold the plank position, engaging core.

Bosu Ball Hand Plank

Cross Body Mountain Climber