Plank
1. Start at the top of a pushup position and lower yourself down onto your forearm with your body forming a straight line. Tighten your abs (as if you’re bracing for someone to punch you in the stomach, ouch!) and hold it for 60 seconds.
Trainer’s Tip: If you can’t make a full minute, start with 10 second intervals, resting for 5-seconds between, until you complete a full minute.