Give this a try. If you cannot do a pull up, do assisted pull ups with a band, or do ring/body weight rows.
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.
Yesterday was the Tactical Strength Challenge(TSC). This is a worldwide event held in many locations around the globe. This event consisted of a max deadlift, max repetition pull ups, and max repetition kettlebell snatches in 5 minutes. This is always a fun event. Stay tuned for the results.
To learn more about the TSC, go to their website.