For me, it was my hip. I don't know what I ever did to offend it, but holy christ, it bothered me every day for years. I was in really good shape, too, but working way, way too much to get it looked at.
I finally did, and it never bothers me anymore. I think it was just tight back muscles pulling everything out from a decade of bush stomping and digging in rubber boots. Agony though. I really sympathize with anyone who's got any sort of joint pain.
Deadlifts. Do deadlifts. You don't have to do heavy, just light or moderate. Or if you want, air squats.
Please don't do deadlifts and only deadlifts, it'll end up as yet another repetitive movement in the inventory of things executed with shoddy biomechanics. It may work for now but some years down the line those bad habits that caused the issue in the first place will catch up again, probably in another place, rinse and repeat, unless you re-build all your movement patterns to not include those bad habits.
Baseline should be something like Physical Therapyish mobility and/or Callisthenics core strength, note in just how many different ways the callisthenics stuff works on the same thing while including the opposite for balance, while the PT stuff goes through basically everything that can possibly be tight. Both will make lots of muscles that you didn't even know you had complain very loudly and learning about "new" muscles, how to activate them and what to do with them is how you fix your shit from the ground up.
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