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“Instead of a gazillion crunches, do fewer reps at a slower pace to work your muscles to the max, says Adam Zickerman, coauthor of Power of 10. For each move, follow this pace: 10 seconds to come up, a 2-second squeeze, then 10 seconds to come down. Maintain a continuous, fluid motion – no resting between reps. Repeat each exercise to fatigue (until you physically can’t do another), once or twice a week.”