There are no genetic arguments on this subject any longer. Those experienced keepers that keep and or breed spiders are generally all working by the same playbook. There are only threads where these things are trying to be explained to people who don't have any experience with the morph. I believe exercise helps. Stress reduction helps more. I keep my animals in tubs so I bring my spiders out once every few days to exercise so I do not know whether the branches would help or not. Generally a happy ball python is lazy and doesn't do much so I don't know how much it would actually climb.