Reddit reviews Rock Climbing Technique: The Practical Guide to Movement Mastery

Buy John Kettle's new book and get a head start on all your friends ;-)

Feet. Focus on precise foot placement and pushing from your lower body rather than pulling with your upper body. "Silent feet" is an often recommended exercise, where the point isn't the silence as such; the point is that in order to be silent you have to be focused & precise.

(Full disclosure: I am not John Kettle. My only connection with him is as a satisfied customer of his coaching business)

Just keep climbing and try to focus on technique. I bought this kindle ebook and its drills are useful for me even though Ive been climbing for a while. If I had started these when I began climbing Id probably be leading 12s right now! They are not training, they are technique drills and you find yourself slowly incorporating the movements while you climb and finding new ways to read routes and before you know it you are not even thinking about it.

https://www.amazon.com/Rock-Climbing-Technique-Practical-Movement-ebook/dp/B07C68HLRK/ref=tmm_kin_swatch_0?_encoding=UTF8&qid=1562084256&sr=8-2

Rock Climbing Technique: The Practical Guide to Movement Mastery https://www.amazon.com/dp/B07C68HLRK/ref=cm_sw_r_cp_apa_i_Cd97Cb0H5H0VG

Get a copy of that and start working on your technique. Your fingers will develop naturally while you do technique drills.

Technique is the biggest thing to improve but the most vaguely talked about. This book at least gives you specifics to work on. I found it pretty easy to understand. Changed my climbing pretty quickly.

It's sort of like this: if you train finger strength, say, then you can hold on to smaller holds with a large % of body weight on your hands. Technique is designed to take weight off of your hands. So by getting stronger or by getting better, you get a similar result in terms of going up the grades.

However, if you have less weight on your fingers in the first place, you're going to be less prone to injury, which is a huge plus. Injury shuts down progress longer and more absolutely than anything.

If you were to climb outside a lot, especially if you went out with experienced people, you'd get the technique from them.

In your case, having a high base level of fitness from lifting means that you won't see the gains weaklings like me did after a few weeks of core training. But your biggest quick fixes and long term gains will come from skill based practice.