20-1 Push ups
1-20 Sit ups

25:00 time cap
In other words:
For time:
20 push ups
1 sit-ups
19 push ups
2 sit-ups
18 push ups
3 sit-up
17 push ups
4 sit-ups
16 push ups
5 sit-ups
15 push ups
6 sit-ups
14 push ups
7 sit-ups
13 push ups
8 sit-ups
12 push ups
9 sit-ups
11 push ups
10 sit-ups
10 push ups
11 sit-ups
9 push ups
12 sit-ups
8 push ups
13 sit-ups
7 push ups
14 sit-ups
6 push ups
15 sit-ups
5 push ups
16 sit-ups
4 push ups
17 sit-ups
3 push ups
18 sit-ups
2 push ups
19 sit-ups
1 push up
20 sit-ups