Start on mat on all fours, then tuck toes under and press hips back and up as you step back to form an upside-down V; lift right leg behind you. MAKE IT EASIER: Keep both feet on mat. With right leg lifted, shift body forward to come into full push-up position, shoulders over wrists. Hold for one count; return to start. Do 10 to 15 reps; switch sides, repeat. Do 2 to 3 sets.