Muscle it up: Side Plank

Targets: gluteus medius + obliques + shoulders + upper back + core

Start by lying on your side. With one hand on the ground and your feet stacked together, raise your hips so your upper body and legs are aligned with the floor at a 30- to 45-degree angle. Stretch your free arm toward the ceiling. Hold the pose to fatigue, breathing deeply. Repeat on the other side. “I use this one with my patients, says Keller. “You’re really engaging your core, and it’s a great shoulder and oblique workout.