My 15 yr old son came home from school limping one day. He told me he'd gotten a sore (pulled) muscle while running Track & Field. He was extremely sore on his lower right abdomen. Like a smart mom, I came to this site looking for suggestions! I then soaked a square gauze pad (paper towels would do) with organic Apple Cider Vinegar w/the "mother", and placed that over the sore area for 1/2 hr and had him stay still. After the time was up, my son said 90% of the pain was gone. Amazing remedy. Thank you, Earth Clinic!