I have developed a pedal device, Stepit. See www.stepit.se/eng. It is meant to stimulate the lower leg muscle pump, "the second heart" to avoid ankle swelling when sitting still for a long time, to prevent DVT, to help healing foot ulcers in diabetics.
I would like to equip it with a sensor making it possible to count steps and communicate with the Apple Health app, which I personally use every day.
Need to talk to a developer!