You'll cover just over 4 miles in 40 minutes with this sweaty treadmill routine! Long intervals keep it challenging while giving you time to recover.

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This 25-minute fat-blasting treadmill workout is actually fun! Lose weight and tone up with this super fast and easy routine.

Long Fartlek Countdown Running Workout: Get faster and have fun with this 60 minute fartlek countdown workout.

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