📝 Editor's Note · 2026-07-22 · by Dr. Elena Morales

My resting HR just hit 58 bpm — lowest since I started tracking in 2019, and I didn't change anything

Garmin chest-strap reading this morning: 58 bpm. That's down from 62 in early June, and down from 68 when I started tracking in 2019. I didn't change my diet, didn't add strength training, didn't cut caffeine. The only thing I changed: started zone-2 60-min bike commutes M/W/F on June 2.

The HRV gate was the non-obvious part. My rule: if morning HRV is ≥10% below my 30-day rolling baseline, skip the zone-2 and do 20 min mobility instead. I skipped 6 of 24 planned sessions this way. My theory: those 6 skips prevented the plateau that usually hits at week 5. Next metric I'm watching: time-to-exhaustion on a 200W test (baseline 22 min, aiming for 30 by September).