In reply to UKC Articles:
I stumbled across Peter Mortensen's YouTube videos and website when I became interested in achieving a one-arm pull-up some time ago. I think most climbers have trained pull-ups in one form or another for a period of time and it is natural to be interested what are the limits of performance with this exercise.
Some climbers are solely concentrated on their climbing ability, but many (like me) are also interested in general physical development. I find the article and the website a good motivational tool. To be honest I am surprised with the negativity of some comments. Even if one-arm pinky pull-ups may be only loosely related to climbing ability, there is no need at all to ridicule the article.
I started climbing and training in January after a 5 months layoff from any physical exercise. I do weights once a week now. I recently broke my personal best with a full range of motion neutral-grip pull-up with +44kg at 70kg body mass. It feels good when you achieve personal best results. And I am back with my climbing ability as well.
I respect what Peter Mortensen has achieved. And his website shows that it is possible to become very strong training at home. Stevie Haston's blog falls in the same category - and the author has done 9a being 52 years old, and literally does thousands of pull-ups including one-armers.