The role of pelvic floor exercises and anal sphincter exercises in FI is poorly determined. While there may be some benefit they appear less useful than implanted sacral nerve stimulators. --> These exercises aim to increase the strength of the pelvic floor muscles (mainly levator ani). The anal sphincters are not technically part of the pelvic floor muscle group, but the EAS is a voluntary, striated muscle which therefore can be strengthened in a similar manner. --> It has not been established whether pelvic floor exercises can be distinguished from anal sphincter exercises in practice by the people doing them. --> This kind of exercise is more commonly used to treat urinary incontinence, --> for which there is a sound evidence base for effectiveness. More rarely are they used in FI. The effect of anal sphincter exercises are variously stated as an increase in the strength, speed or endurance of voluntary contraction (EAS).