It's important to challenge ourselves to keep things fresh. But if you've been lifting for 20+ years, have been on all kinds of gear and are pushing 40, you've been there, done that and are on the downswing now. Doesn't mean you can't still be strong and look great but your best days in that arena are past. If you need to hit fresh PRs to stay motivated, best to work on areas you've neglected and would like to improve.
It took me several years to arrive at this mentality in my 40's. I used to lift 6 days/week and would train like an idiot - attempted max or AMRAP every workout. I'm now down to lifting twice/week with BJJ/wrestling 3 days/week. If there is one lift I will do as long as possible, it's ATG barbell squats. More than any other lift, I'm convinced it maintains size/strength and boosts natural test as long as your diet and sleep are on point. But I go light now, never do 1RM and it's been months since I've even repped 1.5x BW.
Areas I've improved in my 40's are flexibility, grappling and oly lifts. I stretch for 5 minutes every night before bed and can invert and touch my feet to the ground again, which I couldn't do since early 20's. 2 years ago I couldn't do a front rack position with a barbell but can now do (dogshit but serviceable) snatch and C&J. And despite my SBD numbers going down, I'm a more effective grappler than I was 6 years ago - went from an aging wrestler/Judo guy wrestle-fucking blues to a seasoned purple belt knocking on brown.
I'm also a lifelong runner but have dramatically cut back in the last few years due to knees hurting. If I ever get to the point of not being able to run, I will switch to biking for my outdoor cardio runners high. The point is there are always other directions to take our training.
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