WOD: Run and Squat

Today I will show you a very good workout, designed to increase endurance and oxygen capacity of the athlete.
Down the list, workout looks very easy, but for many of you I'm sure will prove to be quite intense. The catch lies in the fact that after you ran 400 meters you need to do 50 squats, which will greatly inflate your thights. Then you have to do this round 3 more times. Do this workout for time.
However, once you feel confident of doing it you can put some weight when doing squats, increase the speed of running and\or do some extra rounds.

4 rounds for time
Run 400m 
50x Squats 

Keep it Strong!