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.
For time:
Run 400 meters
155-lb. clean and jerks, 15 reps
Run 400 meters
30 toes-to-bars
Run 400 meters
45 wall-ball shots, 20-lb. ball
Run 400 meters
1.5-pood kettlebell swings, 45 reps
Run 400 meters
30 ring dips
Run 400 meters
155-lb. weighted lunges, 15 steps
Run 400 meters