Push presses and pull-ups on the minute

Today's WOD: Every minute on the minute for 20 minutes:

• 5 x push presses (115lbs)
• 5 x pull-ups

Workouts like this are completely messed but valuable. I find that I work significantly harder when the WOD is regimented like this. I'm quite sure that if this WOD was simply for time that I'd never do it sub 20.

Some notes: The first 10 minutes were no problem, the final 10 minutes were hell on earth. After a dozen rounds I couldn't push press to full extension so I dumbed it down to 105lbs -- still pretty heavy. And psychologically this was a very demanding WOD. This one is what CrossFit is all about.