Gym creates time and creates focus, by the way. It's not that I "don't have time" for gym. Rather, if I'm stuck on a concept, lack focus, or lack motivation - I perform physical exercise, and that helps me gain focus, allows my mind to explore insight in a more creative way, and possibly gets me un-stuck from a local bog. Simply switching the mindset, from gymm is unpleasant and time-consuming, to gym is a mechanism for inspiration and time creation, allows me to go to the gym more. And the benefits are real: gym allows me time creation and being more mentally agile.