Quick-paced circuits are amazing for many reasons: they improve your cardiovascular fitness, cause you to expend loads of energy both during and after the workout (meaning you'll burn mega cals), and are perfect for squeezing in a workout when you don't have a whole lot of time. Studies conducted on women have also shown that they are wonderful when it comes to weight loss and even in improving self-esteem.
Try our total-body circuits program for a speedy but effective routine you can do at home or at the gym. On the road? Use resistance bands instead of dumbbells for your strength exercises.