Complete as many reps as possible in 12 minutes of:
1 strict pull-up, 2 push-ups, 3 squats
2 strict pull-ups, 4 push-ups, 6 squats
3 strict pull-ups, 6 push-ups, 9 squats
Etc.
Start at a higher round if you think it will allow you to complete more reps in the 12 minutes—e.g., 5-10-15, then 6-12-18, then 7-14-21, etc.
Post starting point, finishing point, and total reps completed to comments.
With constant motion and slowly:
21 single-arm dumbbell rows, each arm
9 ring dips (deep and strict)
30 squats
15 single-arm dumbbell rows, each arm
12 ring dips
30 squats
9 single-arm dumbbell rows, each arm
15 ring dips
30 squats
For 20 minutes perform:
Strict pull-ups - push-ups - squats
5-10-15 reps
If you can finish 8 rounds by 5:00, switch to:
10-20-30 reps
If you can finish 4 rounds by 10:00, switch to:
20-40-60 reps
If you can finish 2 rounds by 15:00, switch to:
40-80-120 reps, then stop.