clarissaclarissa The "Sweat Is Just Fat Crying" Workout! Interval-style, H.I.I.T. Training. Do it at home!
carmencarmen Interval training. So much better than lots of miles on the treadmill, and it really does work!
kirstenkirsten Crazy intense interval training workouts that are >20 mins "that make you more sore after doing a 12 min workout than after running 5

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