Directions: Start with a 5-minute warm-up walk. Then, run as fast as you can for 60 seconds. Slow back down and jog or walk for 2 minutes. Repeat the 1-minute run and 2-minute active recovery for 21 minutes. Each week, add 3 minutes until you get to 36 minutes.
Equipment Needed: none (except a can-do attitude 😉)