Back Squat: 5-5-5-5 & 21-15-9-6: Run, Back Squats and Pull-ups

Back Squat: 5-5-5-5

Back Squat 5-5-5-5

Use the heaviest weight you can for each set.
Rest as needed between sets.

21-15-9-6: Run, Back Squats and Pull-ups

21-15-9-6 reps, for time of:
Run 200m
Back Squat (115#/75#)
Pull-up