Hey! Love the idea—data is great for feedback, but I’d hate to turn it into a spreadsheet of misery. Maybe we could layer the metrics with playful challenges, like a “pulse‑based sprint” that unlocks a new badge only when heart‑rate hits a target for a minute. That keeps the tech sharp but the vibe fun. Let’s hash out the math for the threshold curves and then think of a gamified UI that nudges rather than nags. You got the numbers? I can run a quick regression on the stride‑variability data.