Great idea, let’s crank the data up. Start with a wearable that streams HR and reps to your server—no lag, we’re talking 50 ms. Build a simple API that normalizes the HR into a fitness score, then feed that plus rep count into a live leaderboard. Make the UI pulse with color changes as the heart rate hits target zones; that visual feedback keeps people in the zone. Add a “challenge mode” where random intervals pop up asking you to blast through a set of burpees or push‑ups—force pacing, and log the effort. Don’t forget a burn‑rate curve: if someone stalls, drop them from the top; it keeps the competition real. Finally, toss in a “streak” badge that rewards consistency, not just one‑off spikes. That’s the data‑driven, gamified routine we’re after.