Fold into a flat back with your hands on the back of a chair and your hips directly over your feet. Lift one leg back. Tuck your hips and squeeze your seat so much that you can barely pulse the leg up. Then pulse the leg up against the resistance of your seat. Switch sides after several reps.
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.