Sitting all day tightens your hip flexors and weakens your glutes, which pulls your pelvis forward and strains your lower back. Poor blood flow to your hips also weakens nerve signaling, leading to hamstring pain and knee problems down the line.
All of this can come because of your sitting all day. You might notice you are experiencing middle or low back pain. You might have hamstring pain, some kind of distension of the gut because your gut is billowing forward from that pulling of that tight muscle. You could also have decreased blood flow and nerve response in the hips, weak gluteals, knee pain.
