What You'll Need: 3- to 8-pound dumbbells, a mat (optional)
How It Works
Do Jillian's 3-2-1 interval method four days a week. Warm up for five minutes by jumping rope or running in place. Next, move on to the three circuits: Do three minutes of strength (30 seconds per move; repeat entire circuit once); then do two minutes of cardio (30 seconds per move; repeat entire circuit once); and finish with one minute of core (30 seconds per move). Do three sets total.
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