Swamped at home, and craving exercise but you can?t spare a minute for the treadmill, much less get motivated to set an incline? Our solution? Total Workout in Ten, developed by the editors of Women s Health Magazine. This intense workout allows you to customize your burn based on your time, energy level, and target zones. Four routines, each approximately 10 minutes long, and each with a different focus — cardio, upper and lower body toning, and balance and flexibility. There is also a "bonus" 12-minute core workout. Amy Dixon instructs.