Want to Know What a Core-quake Feels Like? Try Jordan Chiles's and Simone Biles's Ab Workout

• Lie on your belly, and extend your arms straight out in front of you.
• Pull your belly button into your spine.
• Lift your legs, arms, and chest off of the floor, squeezing your glutes and legs as you do and keeping your arms by your ears.
• Hold this position for five seconds before lowering to the ground.

Repeat these two moves — Superman pulse and Superman hold — one more time.