Copenhagen Plank

Lie on your side with your forearm under your shoulder and place the top leg on a sturdy bench or elevated surface. Brace your trunk, press the top leg into the support, and lift your hips until your body forms a straight line while the lower leg remains off the floor. Hold this position with steady breathing, then lower your hips under control. Keep the pelvis stacked rather than allowing it to rotate forward or sag toward the floor.