Originally Posted by Camilo

Certainly something is helping that specific fitness, but you'd have to explain how cycling works the lats in any meaningful way. I can't imagine it. Biceps, maybe (but not much). But there's no lats involved no matter how much you pull on the handlebars from a sitting or standing position.

What are your PT band exercises?

And you don't think your DAILY MULTIPLE SETS of pull ups aren't what's causing your max to increase???

Yes, I'm pretty sure you're looking at the wrong place for your improvement.