Seconding the massage gun, I had terrible muscle pain around my knee for over a year and after using one it went. I nearly fell off the bed as there wasn't any pain. I'm now trying to loosen up the ligament/tendon around the knee and in my hip as it's still tight....It's really nice to be able to go on a long walk and not be in pain or having to use sticks when going downhill
I know I may sound like an Amazon review, but the difference is amazing, and also reassuring as I thought I would be heading over hill into pain and general decrepitude....I'm also using it to loosen up the bf's knotty shoulders and bad back
My issue was also knee pain. I could never get my lower quads to relax. Massage gun got them on the first use. They're also great for trips where you'll be walking a lot.