With a continuously running clock, do one pull-up the first minute, two pull-ups the second minute, three pull-ups the third minute, continuing as long as you are able.
Use as many sets each minute as needed.
Post number of minutes completed to comments.
Fittestry | CrossFit Long Beach 
Steph: 4 minutes
Nando: 5 minutes
Both of us did strict ring pull-ups
10 Rounds – dead hang switch grip