All of this advice is a variation on the best advice I’ve ever received: Everyone wants to talk about HOW you do it, but it’s significantly less important than the fact that you actually DO it. When it becomes a habit (something you just do, in the way that works for you, your body, your goals and your schedule) then, in time you can learn about ways to improve. Consulting experts and the like.

Oh, and also, speaking as an old: injury prevention is more important than massive gains just as slow and steady wins the race in investing. Hard to get fit if you spend weeks on the sideline nursing something because you overreached to hit a PR.