Overhead squats is a skill. Make sure you possess the necessary skills before loading up a bar. Until you can get in the accurate position, it is strongly recommended that you substitute with a front squat for load and practice the overhead position with pvc pipe or an 18lb bar. This is quite different than trying to get loaded and then do overhead squats=)
Strength/Skill Day
Overhead Squats
3-3-3-3-3-3
then….
1000m Row
5 minute rest
1000m Row