While playing tug of war with my students , I think I pulled something in my back. I am having pain on my lower back side on the left. It hurts to sit and stand depending on the position. I m fine when I m still in bed but endure discomfort if I change positions. I can t bend or squat without some type of pain. I don t know if I pulled a muscle or something else
If no pain down legs, weakness in legs you might have developed lumbar muscle spasm. It will get relieved by rest, muscle relaxants. Also do core strengthening exercise when you are comfortable so that you don't develop these problems later in life.