Do you often feel like your muscles are always tired? Are you experiencing on and off back pains and strains? The above experiences are caused by muscle fatigue, but unfortunately, most people ignore these feelings until the last minute. Muscle fatigue has become common today more than ever, and it is all thanks to the sedentary lifestyle that most people lead. For example, poor communication between body systems, inadequate motion and lack of hydration are all to blame for muscle fatigue.