Android iPbike on my Samsung Galaxy S4. I have a SC Ant + sensor and a Miolink wrist HRM. It's the same set up for riding outside.
As for 'inside' some, including me, have allergies which preclude riding during the spring months. Seventy-three years have taken its toll. I'm happy to be able to ride a bike, even if it is inside when the weather prevents going outside.
Rich
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..life is like a roll of toilet paper. The closer it gets to the end, the faster it goes. ― Andy Rooney ...enjoy what's left!