I recently spoke to Mohit Kumar, cofounder and CEO, Ultrahuman, a fast-growing consumer health startup, as part of my PMF Convo series, where I speak to founders, operators, VCs who have struggled with PMF (product-market fit) successfully, or unsuccessfully, with the startups they have founded or worked with (or work at).

Ultrahuman sells such devices as the Ring Air, a sleep tracking wearable; M1, a continuous glucose monitoring …