<s>[INST] I fell on my buttocks bowling and the next morning I woke up with extreme pain in my buttocks and slightly down the back of my leg. Almost like a pulled muscle. It s been 2 weeks and I m still having a problem sitting without pain and having trouble walking. There is no visible bruising. I m a runner and I m having trouble running because it s painful. I ve tried stretching but it s even painful to stretch. Not sure what I ve done or what I need to do to make this better [/INST] it's a muscle injury you are right, but the time frame of healing could be a bit long eras you can see...after the injury the initial response is swelling and pain...after the initial swelling dies down pain decreases but does not disappear entirely this is so because the muscles are now recovering .or in the healing phase of injury.therefore it would still be tender at this phase which usually last for 4 weeks if in case there might be persistent pain after it could be a scarring of your muscle which would benefit from a physical therapy </s>