Go to https://www.martialartssupermarket.com and order some thai linement. rub it into everything that hurts (outside the groin protector, there's menthol in it) Prior to training, warm up for at least 10 minutes, then stretch when you're warm. After training intensely, a cool down period as long as your warm up would help. If you do get a strain, RICE. Rest, Ice, Compression, and Elevation. Another thing you can do to prevent over stressing is to supplement Glucosamine, Chondroitin, and Collagen to build connective tissue. Hope that helps.