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The Scientific 7-Minute Workout - NYTimes.com
30 seconds each 10 sec. rest
30-Minute Cardio Interval Workout | Pumps and Iron
Can You Get Fit in Six Minutes a Week?...
High intensity interval training
Mixing weight training and aerobics (NYT)
Try This Fat-Blasting Treadmill Interval Workout
Spin interval routines
Good HIIT workout- did this only 1x through and broke a major sweat!
15-minute express cardio workout