New exercise routine

I've been pretty good about staying active, and keeping in shape. I play tennis twice a week, I run/bike 2-3 times a week. I do push-ups, sit-ups and pull-ups on an intermittent basis. Starting this week, I'm going to add this exercise routine everyday:

In 3 minutes do: 25 push-ups, 25 sit-ups, 5 pull-ups and rest until the 3 minutes is up. Do this 5 times. Right now, I can only do this 4 times. I'm hoping to get strong enough to be able to do this 10 times (30 minutes).

I'll report back with progess at some later time.