Max Out

In 4 mins, for max reps of:
Run, 400 m
max reps in remaining time Air Squats
— then —
In 4 mins, for max reps of:
Run, 400 m
max reps in remaining time AbMat Sit-ups
— then —
In 4 mins, for max reps of:
Run, 400 m
max reps in remaining time Push-ups
— then —
In 4 mins, for max reps of:
Run, 400 m
max reps in remaining time Pull-ups