Zone Pedal

Supported steady rides use HR-guided resistance when trainer headroom exists. Short intervals stay power-led. No account or subscription.

Zone Pedal watches your heart rate and adjusts compatible smart-trainer resistance during supported HR-adaptive workouts. Not fixed watts for every phase — steady efforts can follow your body's response when your trainer has usable low-power headroom, while short intervals stay power-led with HR guardrails. Calibration and qualifying interval rides teach the model; steady rides use that model and update only what the evidence supports.

WHAT YOU NEED

Two things: a Bluetooth heart rate monitor and a Bluetooth smart trainer.

Heart rate monitor — standard Bluetooth chest straps and arm bands provide the heart-rate signal. Aerobic Threshold Finder and DFA alpha1 threshold analysis require a chest strap transmitting RR intervals.

Smart trainer — FTMS, Tacx FE-C over BLE (Neo series), or compatible Bluetooth Cycling Power Service for power display. Bluetooth only, no ANT+.

One fit note: heart-rate control needs your easy Zone 2 power to sit above your trainer's minimum resistance. Zone Pedal checks that headroom during rides and labels the limit instead of reporting clean controller authority when your setup is pinned at the trainer floor.

That's it. No account, no subscription, no cloud service.

HOW IT LEARNS

Discover and qualifying interval workouts teach Zone Pedal how your heart responds to effort — how many beats per watt, how quickly your HR follows power changes, how fast you recover between intervals. That calibration helps later Zone 2 rides start from your evidence instead of a generic guess.

YOUR CARDIAC PROFILE

After a few interval rides, the Your Body tab tracks how your cardiovascular system is changing:

• Cardiac efficiency — beats per watt, trending over time • Endurance stability — how steady your HR stays during long efforts • VO2max estimation — from your power-to-HR relationship, with confidence intervals and age/sex-adjusted fitness category • Aerobic threshold — from DFA alpha1 fractal analysis of your HRV, tracked over time

Every comparison is against your own baseline. Your progress, measured against you.

IMPORT ZWIFT WORKOUT FILES

Open supported .zwo files and Zone Pedal maps them into bounded control modes. Steady sections can follow HR targets; short intervals remain power-led with HR ceilings and post-ride honesty. Preview the structure before you ride.

13 BUILT-IN WORKOUTS

Calibration: Discover Your Cardiac Response (20 min) Aerobic Threshold: Aerobic Threshold Finder (35 min) Endurance: Zone 2 Base, Tempo, Recovery, Steady Zone Power-Led Intervals: Sweet Spot, Threshold High Intensity: Norwegian 4x4, Seiler 4x8, Billat 30/30, Rønnestad 30/15, Tabata

Start with Discover Your Cardiac Response. One 20-minute ride begins calibration, and qualifying interval rides keep teaching the system how your heart responds to effort.

PRIVATE BY DESIGN

All data stays on your device. No account required. Optional Apple Health export. $29.99 once — no subscription, no recurring billing.