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Jumping jacks have come a long way since middle school.
With these 10 brutal CrossFit workouts that will get you shredded.
5 early-morning routines to start your day right.
Burn away the last of your flab with these high-intensity burners.
Build strength, speed, flexibility, and endurance.
Lower your "fitness age" in just seven weeks.
Melt fat fast with this comprehensive primer on HIIT.
Follow this guide to get lean.