Annie Mulgrew, program director of City Row, demonstrates a short, efficient fat-burning workout she created. "The key is to work to your maximum capacity and to do as many reps as you possibly can during the work phase," she says. Don't do these at a leisurely pace. To get the impact of interval training, do these exercises as quickly as you can while still maintaining proper form. Perform each for 45 seconds, followed by a 15-second rest, and begin the circuit again.

Annie Mulgrew, program director of City Row, demonstrates a short, efficient fat-burning workout she created. "The key is to work to your maximum capacity and to do as many reps as you possibly can during the work phase," she says. Don't do these at a leisurely pace. To get the impact of interval training, do these exercises as quickly as you can while still maintaining proper form. Perform each for 45 seconds, followed by a 15-second rest, and begin the circuit again.

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