Fast Twitch Muscles
Photo by Collin Orcutt

Good news for packed schedules — short interval training is a great way to stay in shape. New research shows that short bursts of exercise are just as effective as long slow cardio sessions for keeping fit. The study found that those who worked out for 40 to 60 minutes five times a week were just as physically fit as those who did 20 to 30 minutes of intervals thrice weekly.

Do it Today: Start your 20 minutes of interval training today for a more effective weekly burn.

Red Light, Green Light:

Everything you ever wanted to know about interval training.

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Some killer tips to help maximize every gym session for better results.