>>76753475 (OP)
Stretching and flexibility are way more important than most younger people think. Most typical injuries you get in your everyday life or gym happen because you weren't flexible enough and you body panicked and either hit the breaks and reverse or started bending somewhere else to compensate.
Warming up is really helpful, resistance bands sound like a useless gimmick until you get your first shoulder injury, then they become a staple in your warmup routine.
Strength isn't as important, I'm a tradecuck who has to lift and carry all kinds of shit at work, but tbt your squat, deadlift, bench, etc strength doesn't really translate all that well to lifting some odd shaped bs at work. Knowing how to brace well does help tho. So unless you're a powershitter just focus on your physique / aesthetic. Egolifting, hitting PRs every week, etc are fun and all, but it all will eventually backfire. I'm not saying don't lift heavy, I love lifting heavy, I'm just saying use your head while doing so. It'll allow you to lift weights and have fun for much longer instead of quitting because of some bs trauma that could've been easily avoided if you weren't peacocking.
t. very late 30s