Tabata Something Else Workout

8 rounds each exercise; 20s on 10s off.
Pullups - red band (9, 9, 9, 9, 8, 8, 7, 6)
Pushups - 1 abmat (13, 9, 8, 6, 4, 4, 5, 5)
Air squats - (15, 17, 16, 15, 15, 14, 14, 16)
Situps - (12, 11, 10, 10, 9, 9, 9, 9)

Some of pullups should have been no reps