After all, it's much easier to maintain a sprint when a machine ... consists of continuous running -- your recovery intervals should be a light jog followed by a walk or complete rest.

The 100-100 run/jog interval workout: As you improve your conditioning, try this sprint/jog workout every ... at 85%-95% of your maximum heart rate. Walk/jog 3-4 minutes of active recovery to ...

Sprint at your maximum effort for 30 seconds. Walk or jog for 1 minute to recover. Repeat for 3 rounds. RELATED: 10 Easiest ...

In the same way switching up the types of exercises you do in the gym will help you avoid performance plateaus and get stronger faster, varying how fast and slow you run—throughout a week of ...