I finally realized that I've become a fat slow slob. I'd like to change that but I don't want to do things randomly. Unfortunately, all I could google were training plans for a specific distance. But I want to get faster in the 5k and the mile and the 400m. I understand the progress will be much slower when training for all of those distances simultaneously compared to just one at a time but I'm okay with that. I don't aim to compete. Any advice?