+1 on the idea of a solid Stretching plan.

Years ago, I tore up a bunch of the hip flexor muscles and have struggled with keeping them flexible and strong enough. It can impact the angle of the hips, the ease with which we stand, walk, do lifts and rotations, and in general the strength of those flexors (ie, something as seemingly simple as lifting a leg up and over a bike saddle).

A variety of stretches might be worth incorporating into your regimen -- for strength, range of motion, and rotation:

https://www.sensational-yoga-poses.c...stretches.html

https://www.stretching-exercises-gui...stretches.html

https://www.menshealth.com/fitness/a...ve-tight-hips/