60 Minute Speed Interval Workout

Looking for a new way to include speed work into your routine? This is a 60 minute speed interval workout with constantly changing distances.

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Treadmill Workout: 60-Minute Walk-Jog Treadmill Workout

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Interval Training Workouts Build Speed and Endurance

30-Minute Interval Running Workout

60 Minute Speed Interval Workout

4 ! 4 minutes aerobic interval training model.