Run/Heavy Thruster Couplet Workout

Skill
3x5 Weighted Ring Pullups (60s rest)
5 mins of Double Under & Handstand Walk Practice
Some muscle ups

WOD
Five rounds for time of:
Run 400 meters
7 Thrusters (50kg)
The thrusters were supposed to be done with 60kg but that would be way too heavy!
By the way, this is a PR by almost 12 minutes since the last time I did it back in August.