San Francisco-based Minna Life has a Kickstarter campaign for, not exactly a wearable device (I don't think), but certainly one that takes exercise and self-monitoring to new places: kGoal, "the world’s first smart Kegel trainer."

Apparently, the first Kegel trainers were developed in the 1940s using "an air pressure balloon and a tire gauge," and haven't evolved much since then. But given that "Strong pelvic floor muscles are a critical part of a healthy body," and play a role in healthy childbirth and postpartum recovery, bladder control, and posture and balance, there's no reason it shouldn't be taken seriously.