Pain during exercises may help to explain non-adherence to exercise programs, which is why continuous pain monitoring may be an important factor in explaining adherence.The latest systematic review on self-reported adherence to home-based intervention rehabilitation programs concluded: ‘The results expose a gap in the literature for well-developed measures that capture self-reported adherence to prescribed but unsupervised home-based rehabilitation exercises’. A lack of objective measurements limits the ability of clinicians and researchers to evaluate the outcome of exercise interventions.