I had an adductor tear a few years ago and I used the Starr rehab with good success. I had some warning signs before the tear happened and towards the tail end of my recovery, my other adductor started acting up.
Since then, I've had what felt like a few minor strains, but after a lot of experimentation with recovery & prevention, I've decided that the root cause is a muscle cramp. The reason I think this is because stretching the adductor produces quick recovery and prevents it from happening again. Since I've included adductor stretches in my pre-squat routine, I haven't experienced any other adductor pain.