You can apply FRC principles to your movement patterns as well. Flexibility+Strength=Mobility.
Try slowing down and actively pulling yourself into your end range of motion. If you adductors are chronically tight, even though you always stretch them, maybe it’s because your brain knows you can’t actually control that position. Getting stronger might solve your problem.
Frontal plane movement and strength in the frontal plane is essential for building and maintaining hip, knee, and low back health as well as for sports performance. If you aren’t doing work in the frontal plane start. If you already do frontal plane work..work harder at it!
Shown are some side squat iso holds. I’m pulling myself into my end range for this movement pattern, and using my hip flexors to try to get a little bit more hip Flexion while pushing the floor away to try getting a bit more hip abduction. Create as much tension as possible. Try a few 5 second holds as part of your next warmup or as a mobility filler between leg work. If you have chronic tightness in your groin, try this a few times a week.