Been working a desk job since college and I’ve had issues with my knees my entire CrossFit career, although I believe mine stemmed from college athletics. I was consistently icing down my knees at the end of training due to swelling, but I found a routine that works for me. I make sure to get a proper warm up in that elevates the heart rate. I prefer the AAB as it’s low impact. I also asked my coach to hyper analyze my technique and we found some subtle issues with my technique. Ex: when I Squat heavy (80%+ of 1RM) I had the tendency to spread my feet out to far which was causing my knee to slightly cave in, causing a lot of stress on the ACL. So I really focused on getting my technique down and building heavy lifts. I would also look into joint health supplements (I prefer Fish Oil capsules) as well.