Start on your back in a tabletop position with your legs up and bent at 90 degrees. Extend your arms to your side and pull your abs in and up. Crunch up and pump your arms up and down vigorously. Take 5 short breaths in and 5 breaths out. Aim to pump your arms 100 times.
Do this exercise with the best exercise equipment. We recommend using a bluetooth chest strap heart rate monitor or a smartwatch for more training optimization & performance tracking.