Weight / Fat loss

It also seemed to me that leangains has a bias to aesthetics rather than performance. I want to lose weight for the associated performance benefit (in climbing specifically) and "6 pack abs" while not undesirable, are sadly not my main goal and I couldn't quite pin down any empirical data about leangains and athletic performance.

My thoughts precisely. My goal is to be able to stand half a chance at boxing blokes half my age. Like climbing that means I have to maximize my power to weight ratio. In addition to this Leangains is biased towards weight training. I prefer calisthenics as I need to work my musculature in groups.

Having said that do try and eat breakfast a little later than I normally might