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.
800 meter Medicine Ball Run (20/14 lb) 100 Kettlebell Swings (53/35 lb) 10 Tire Flips and Jump Thru (As Heavy As Possible) 4 200 meter Fire Hose Drag and Pull (50 ft) 100 Alternating Kettlebell Cleans (53/35 lb) 50 Push-Ups 50 Step Walking Lunges