After a hard afternoon of rowing with a friend, I resigned myself to a few days of burning muscles and soreness. But my friend saved the day with a tube of arnica cream. He rubbed it on my shoulders and voila, instant relief and absolutely no aches the next day. The humble arnica flower makes an incredible cream that no medicine cabinet should be without. Use it immediately to speed up the healing of bruises, sprains, sore muscles and other general aches.