Hit the Weights
It's something I've been doing a lot more recently. I do a lot of core work but also lifting weights to get physically stronger without trying to bulk up too much. It's really aided me a lot, specifically in the time-trial position where I'm trying to knock out such high power in an unorthodox position. I do a lot of back work like Bulgarian squats. You need to think about stability when you do them, so they work a lot of different areas. It's not just leg pressing as much as you can; it's about strengthening the muscles that are already there.