For something a little different than the crunch that works similar muscles, try the pike instead:
- Start in a TRX plank position: face the floor and place your feet in the foot cradles with your straps under the anchor point. Point your toes to help secure your feet. Lie on your stomach and place your hands, palms flat, under your shoulders, then exhale and lift up your torso while engaging your butt and core muscles. Make sure your lower back doesn't droop, and keep a straight spine. Inhale and stay for a beat.
- As you exhale, keep your abs engaged and swing your legs in, closer to your body, while lifting up your hips to the ceiling. Keep your feet together and toes pointed. Keep moving up until your hips are directly over your shoulders.
- Inhale and slowly return your body back to plank position.
- Repeat 15 times or continue for 30-60 seconds.
Photo: Leta Shy