Easy day. Felt good the whole time — no resistance, no symptoms, just steady aerobic work outdoors. First outdoor Prowl in the cycle after two treadmill sessions. HR discipline was solid: 134 bpm average — identical to the last Prowl despite switching from treadmill to outdoor terrain with elevation changes. Pace was naturally slower (9:02/km vs 8:15/km) which is expected on real ground. The consistency in cardiac output is the metric that matters.