The lung is a pretty simple movement that you've certainly carried out countless times before, but there are a few significant subtleties that you can consider in order to shield yourself from knee injuries further down the track.
50 Burpees 400 meter Run 100 Push-Ups 400 meter Run 150 Walking Lunges 400 meter Run 200 Air Squats 400 meter Run 150 Walking Lunges 400 meter Run 100 Push-Ups 400 meter Run 50 Burpees