Every minute on the minute for 30 min perform:
Can you continue for 30 minutes? 20 minutes? How about 10? Post results to comments. If you fall behind the clock keep going for 30 minutes and see how many rounds you can complete.
log results to beyondthewhiteboard.com
Reading Corner: Virtuosity - doing the common things uncommonly well - CrossFit Journal free article by Greg Glassman.