I had suffered from stress incontinence for many years (in my forties) and since I have been doing Pilates, it has disappeared.
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Correct instruction of Pilates always incorporates and awareness of the pelvic floor musculature. Strengthening this area directly and indirectly (via fascial continuations of the adductors and TA) will no doubt have a positive effect on this issue.
In fact, I have had clients come to the studio specifically to address this.