Whether you choose to spend the better part of an hour on the stair stepper, treadmill, or elliptical, just be sure to work your way up to a moderately intense 130-150 beats per minute during today's cardio session. This heart-rate range will help you build a stronger aerobic base for better overall endurance, and it will also help your heart better deliver blood and nutrients to your hungry muscles.
AMP: Marc Megna's 8-Week Aesthetics Meets Performance Trainer Phase 4, Day 45
Today's cardio output session is one of your last in the AMP trainer. That means you should go harder, not easier. Get it done!