First Prowl back from the deload. The session that should have been the test — given the Mar 30 – Apr 1 yellow-zone streak — ran completely uneventful. Easy wakeup, easy effort, easy resolution. HR sat exactly where it’s supposed to for Prowl: 135 average is upper Z2, the working aerobic floor. Peak 152 brushed Z3 on the surge, then settled back. No drift, no breath dysregulation, no sense of grinding. The 17 bpm spread is the cleanest steady-state I’ve held in weeks. The bigger signal is the comparison: same avg HR as the Mar 26 outdoor run, faster pace, longer surge. The deload didn’t just clear the yellow-zone debt — it left the aerobic engine running cheaper than before the streak started. That’s the deload working as designed.