If your ideal workout is short and sweet, give the 10-20-30 routine a try. This unique form of interval training features 30 seconds at an easy pace, 20 seconds at a moderate pace and 10 seconds all out. Repeat each one-minute bout five times and each five-minute block two to four times, resting for one to four minutes between each block. Total time exercising is 10 to 20 minutes depending on how many times the five-minute block is repeated.
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