Chin ups, 5 minutes = set + rest: 3 - 3 - 2 - 2 - 2 - 2 - 1 - 1.

Just for fun, before the chin ups, and indeed, before my run, I tried a 1 armed press up - not even near it. The technique is so different from with both arms that surely far more than 30 with both is a prerequisite.