Stress is not the enemy. Unrelenting stress without recovery is. Heart-rate variability — the tiny variation between heartbeats — is the clearest window into which side of that line you are on.
What HRV actually measures
Higher variability generally signals a flexible nervous system that shifts smoothly between effort and rest. A sustained drop often precedes fatigue, illness, or burnout by days.
Raising your baseline
The levers are unglamorous: consistent sleep, easy aerobic movement, slow breathing, and daylight. Members who stack two of these for a month typically see their average climb by a fifth.
Do not chase a daily number. Watch the four-week trend — that line is your resilience, drawn in data.
