Kegel pedometers.

@kaygo, now that is an awesome suggestion!

Thanks. I was thinking about that all I'd seen so far were "coaching" apps, but nothing that actually measured strength.

@kaygo, believe it or not, but I have mentioned to the powers that be at Aneros the possibility of incorporating pressure sensor technology to interactively drive a sophisticated articulating and vibratory Aneros model. Such a device could react in programmable ways to not only anal muscle and rectal muscle pressure but it could also respond differently based upon the frequency of those contractions. I have no idea how much development cost would be involved but it may come sooner than we think.

Good Vibes to You !

I bet it starts with something like membrane switches. Good enough at least for endurance training. Squeeze and hold, and a stopwatch starts, and stops when you can't hold anymore.