This 6 week program combines 2 of the most effective training methods for improving VO2max. You will begin with 3 weeks of high intensity interval training to build your aerobic power. Next you will transition to 3 weeks of shorter, more intense sprint interval training sessions. This will further challenge your cardiometablic system and running performance. Complete the interval workouts each week and add 2-3 easy runs based on your experience level and recovery. Be sure to keep the easy runs truly easy. Be consistent, recover well, and you will finish these 6 weeks a stronger runner than when you started.