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RICE stands for Rest, Ice, Compression and Elevation. This is what you use to treat a sprained muscle. I am going through this right now and have found it to actually work. I sprained a muscle under my armpit on the side of my body. The first day hurt really bad but by the second day I felt better. Then I didn`t listen to the 1st step of RICE and instead of Resting, I worked out. This actually worsened the injury and set me back to the same pain I had on the first day of the injury. After that mistake I started icing it, resting it a lot and because of the location it is basically always elevated and I can`t really use compression on it, like an ACE bandage. But the icing and rest seems to work. If you injure yourself through exercise or any other way, be sure to start the RICE treatment as soon as possible and most importantly don`t use the muscle until it is healed! It is really inconvenient, but can speed up the healing process and not set you back as long if you start the RICE process early on.
Image Source: http://physioworks.com.au/Injuries-Conditions/Regions/muscle-pain-injury-strain-tear-pulled-muscle#.UK0FEJ_yYnU