Pelvic floor dysfunction (PFD), often resulting from weakened pelvic floor muscles (PFM), significantly impacts quality of life and increases health risks, particularly among the elderly. Strengthening PFMs through exercise is effective, yet invasive treatment protocols deter adherence. Non-invasive surface electromyography (sEMG) provides a promising alternative for assessing PFM strength. This study evaluates a reinforcement-based strategy (R-MVIC) against standard verbal encouragement (SVE) for estimating the maximal voluntary isometric contraction strength (MVIC) of PFMs. Using a single-case reversal design (ABAB), we compared peak amplitudes across experimental and control conditions. All experimental sessions occurred in a small examination room at a major University. Using an (AB)