When I do kegels, how intensely should I be contracting my PC muscle? Because if I contract about half strength then I can hold it pretty long, but if I contract fully, it's hard to hold and I have to suck in my stomach a little bit.
But I personally try for moderate intensity for longer periods of time, as this seems to be better for sex. I never feel the need to kegel as hard as possible during sex, so why would I practice that during non-sex times?
I haven't tried any of them yet but apparently there are Android and iOS apps (along with a device) that help you do your Kegels properly. You may want to check them out.