Lots of commentary on the strength and weight aspects, but an equally important aspect for me is to add in a consistent and progressive focus on joint and muscle flexibility with consistent stretching [0]. While doing it initially on my own, I’ve come to realize that there are some stretches and range of motions that you just can’t push yourself (or at least I can’t) to progress without an external knowledgeable trainer who understands biomechanics and joint motion. I’ve been amazed at the range of motion that a joint can exhibit with some time and training.

[0] https://www.health.harvard.edu/staying-healthy/the-ideal-str...