A lack of physical activity (and extreme amounts of it) is associated with lower back pain. Low physical activity is linked to chronic health problems such as diabetes, obesity, and – you guessed it – low back pain. On the other end of the spectrum, high levels and overexertion from strenuous lifting, improper form and overtraining is also associated with higher risk for LBP.
The most common cause for most adults is the former, because low physical activity causes back muscles to lose tone and weaken, which can aggravate LBP and increase the likelihood for muscular contraction, spasm, and stiffness.