This New Interval Training Trend Makes Working Out Faster—and a Lot More Fun The Interval Workout That You'll Actually Love Getting tired of just running endlessly on the treadmill? Try out this workout and you'll never be bored again!
Trying to improve your race times? Add in some workouts - a type of interval training - to improve your speed! - Tap the pin if you love super heroes too! Cause guess what? you will LOVE these super hero fitness shirts!