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Steal these tips from Michelle Lovitt (trainer extraordinaire of Courteney Cox) and melt away about 2 percent of body fat in two to three (very active) weeks.
- Interval train five days a week for a half hour with a heart-rate monitor — working 80 percent of maximum heart rate during sprints and never dip-ping below 60 percent during "rest."
- Do all your resistance training — squats, planks, sit-ups, reverse lunges — on a BOSU ball. "It forces you to use more muscle to keep stable," Lovitt says. Alternate between 15 to 30 minutes of upper- and lower-body exercises every day.
- Incorporate 5- to 10-pound hand weights into all lower-body exercises to maximize muscle use and boost calorie burn.
- Mix up your routine by playing a high-intensity sport at least once a week. Cox, for instance, hits the tennis courts on weekends.