Begin on your knees and forearms, elbows aligned with shoulders, fingers interlaced. Draw shoulder blades down and contract abs to stabilize your torso [A]. Extend your right leg behind you, toes turned under, weight on ball of foot, keeping hips square and pelvis stable.

 

Extend left leg, feet together, so you’re supported on forearms and balls of feet [B]. Hold for 20 seconds; relax. Do 3 reps. Begin with a 20-second hold; gradually build to 30 seconds, then 1 minute. Targets obliques