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

This circuit should be done without stopping, moving through a hollow hold with different arm positions demonstrated here:

• Hold 10 seconds of a regular hollow hold with your arms and legs out long, followed by 10 reps of rocking back and forth.
• Hold 10 seconds of a hollow hold with your hands by your ears and elbows out wide, followed by 10 reps of rocking back and forth.
• Hold 10 seconds of a hollow hold with your arms down and hands over your thighs, followed by 10 reps of rocking back and forth.