The output equation
Sustained high performance is not about how hard you push — it's about how completely you recover between pushes. HRV is the single best non-invasive proxy for that capacity.
Sleep is the first lever
Below 7 hours, decision quality, testosterone and insulin sensitivity all measurably decline. Protect bedtime more than morning routine — most founders have the order reversed.
Downshifting at night
Evening light exposure, late caffeine and screen-heavy work suppress melatonin and elevate cortisol at exactly the wrong time. A 60-minute downshift window before bed is non-negotiable.
Supplementation as a floor
Magnesium glycinate, KSM-66 ashwagandha and low-dose melatonin form a defensible recovery floor. Stack them with the behavioural inputs — they don't replace them.
Training, cold, sauna
Zone-2 cardio raises HRV over months. Sauna improves heat-shock protein expression and parasympathetic tone. Cold plunge sharpens norepinephrine and resilience. Pick two, do them weekly.
- 01Walker M., Why We Sleep, 2017.
- 02Laukkanen J. et al., JAMA Intern Med, 2015 (Sauna).
- 03Stanley J. et al., Sports Med, 2013 (HRV).
Editorial note: this article is provided for educational purposes and is not medical advice. Discuss supplementation with a qualified clinician, especially if you take prescription medication or have a medical condition.
