I used these epsom salts after taking on the London to Brighton Challenge - walking over 100km in 24 hours. Afterwards my body was aching so much, in particular my feet, legs and hips. I used these salts immediately when I returned home in a bath, and the following day to soak my feet. All I can is it it made the world of difference - I felt so much better and my muscles recovered quicker than they ever have! I'd highly recommend them.