I am probably in the best shape of my life (mid 40s) when considering multiple domains. Meaning, I have probably the best combination of strength, flexibility/mobility, endurance, and weight. In other words, I was a bit stronger once, but I was heavier with less endurance. I’ve had better aerobic speed, but weaker. In both cases flexibility and mobility were worse.
I don’t have great data to go on, but I know my SQ and BP are close to PRs, DL is because I never trained it till recently, BW PU and dips are better than ever, same with swings. I haven’t been focused on endurance training for awhile, but my endurance and average speed is not that far off from when I’ve been racing. My flexibility and mobility as measured by what I can do with the Ashtanga primary series is as good as it’s been.
All this happened in a year. I was very detrained last summer. But thanks to what I’ve learned from Pavel, DJ, Maffetone, and Jois, I got back on track.
YMMV