Hi again. Backaches can be really nagging. They can start with pulling a ligament or muscle in any area of the back during any activity. I say any because, I have heard fairly active people pull and injure their back while bending to pick something at home. It could arise from out of treadmill activity (wrong posture, foot pronation or strained lower limb muscles etc) or from strength training (wrong techniques or over-training) or evening a stretch gone wrong. The pain just stays on and prevents them from living fully for weeks. In some cases, the pain returns on doing something strenuous. However, the good news is, you can do a lot if you ever experience this condition. Here are a few good tips: