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3 times through 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.

Begin with strict chest-to-bar pull-ups. Once you fail, start over with strict chin-over-bar pull-ups. Once you fail, start over with kipping chest-to-bar pull-ups.

Use as many sets each minute as needed.