I decided to test myself on weighted kettlebell pull ups. My current stats are: 42, 5' 11", 168#. Here's how it went:
Test:
BW + 12kg KB x 3
BW + 16kg KB x 1
BW + 20kg KB x 2
BW + 24kg KB x 2
BW + 28kg KB x 1
BW + 32kg KB x 1 *Felt Good.
Workout: 16kg weighted Pull Ups
5 4 3 2 1 x 1
