Skill:

Pull-up Proficiency

or
Strength:
Every 30s complete 5 strict pull-ups
continue until you fail to make 5 pull-ups in 30s

Metcon:

AMRAP in 7 minutes of:

1push-up

1 pull-up

1 air squat

2 push-ups

2 pull-ups

2 air squats

3 pull-ups

3 push-ups

3 air squats

etc.....

or

 AMRAP in 7 minutes of

3 pull-ups

6 push-ups

9 air squats