The short answer is yes, Kegel exercises, which strengthen the pelvic floor, do help prevent and then counter incontinence. The exercises need to be done consistently, and they need to be done "correctly," which means flexing the right muscles. You can read how to do the exercises on your own on our website, but there are also tools available that can help.
I saw in my practice last week two women who said their incontinence was 80 percent better after six to eight weeks of daily use of the Intensity pelvic tone vibrator. The Intensity uses electrical pulses to contract the muscles of the pelvic floor; the vibration leads to orgasm, which also contracts those muscles.
Simpler options for targeting the right muscles with Kegel exercises are vaginal weights (like Luna Beads) or the Energie Barbell; Luna Beads are the most popular option at the MiddlesexMD shop). Any of these options inserted in the vagina as directed will help you assure you're flexing the pelvic floor as you intend. With Luna Beads, you can increase the weight for more resistance as you build muscle tone.
The key in any case, with or without tools, is to be faithful in doing the exercises! It's definitely worth it--for lots of reasons that keep you active and enjoying life.