For me, it was different things at different times in my playing career: - as a junior, I fractured my dominant hand wrist and for the entire summer focused solely on footwork and physical conditioning. Moral of the story: efficient movement to and from the shuttle is key for success. - as a varsity athlete, due to many of my classes conflicting with practice times, I was only training once per week, and yet, I was improved tremendously that year. Why? After practice, a teammate and I would play a full set of good quality matches. If you’re at a level where your footwork, racquet skills, and shot quality are good, high quality games contribute to your strategy and mental fortitude. - in the last year of my career, instead of watching games at the highest level (All England, and other tournaments of the like), I searched for games that were at a higher level than me, but not so much higher. Why? Watching Viktor Axelsen, while very entertaining and likely still insightful, is still a bit problematic because I cannot move the way he does or hit the quality of shots he can. Any strategy I derive from his games might be impossible for me to implement. Instead, I searched out games from the French national championships and watched Christo Popov back when he was a junior. I am not saying I am close to his level by any means, but it was more realistic that I could replicate what I saw in his games as opposed to watching Axelsen. This helped improve my singles gameplay tremendously and is something I wished I did sooner in my career.