What Bali Did to My Nervous System

An N=1 data note on what happened to my autonomic markers when I moved to Bali

In September 2025 I relocated from London to Bali. The preceding months had been unusually pressured: logistics, preparation, the accumulated friction of leaving one life and starting another. I was training less than usual and carrying more ambient stress than I typically would.

The transition showed up immediately in my wearable data with some marked and positive changes.

1. The Data

Resting heart rate across the London period had been holding in the 43–45 bpm range. Within weeks of arriving in Bali it began dropping, settling into the 39–41 bpm range by October and largely staying there. That is a shift of approximately 4–5 bpm sustained across months.

HRV told the a similar story. Readings that had been tracking in the mid-to-upper 30s climbed sharply from September onward, peaking around 55–58 ms in October before settling into a sustained range in the low-to-mid 50s through the end of the year. Both markers moved in the direction of increased parasympathetic dominance simultaneously, and both held.

2. What Produced It

This was not a Taijiquan adaptation. I am documenting it here because the autonomic markers are the same ones discussed in the threshold recovery article, and the contrast is instructive, but the mechanism was environmental and lifestyle-driven, not training-driven.

My sleep quality improved substantially. Sleep is the primary driver of overnight HRV and RHR, and the data reflects this directly. Ambient stress dropped sharply. The London period involved sustained low-level activation: logistics, noise, urban density, the cognitive load of transition planning. Arriving in Bali removed most of that load at once. The autonomic system responds to chronic low-level stress in the same direction as acute stress, just more slowly and more persistently.

Consistent daily rhythm. Bali life, for me, quickly settled into a stable rhythm combining earlier sleep, morning practice in natural light, and fewer competing demands on attention. Circadian regularity is a meaningful input to both HRV and RHR, and this was more consistent than it had been in London.

My training volume also increased, not dramatically, but consistently.

3. What This Shows

Sleep quality, ambient stress, circadian regularity, training consistency are all expressions of the same underlying change: a reduction in chronic low-level nervous system activation. The data reflects that reduction. My nervous system responded well to Bali. The data makes that straightforward to say, even if the precise weighting of contributing factors does not matter and cannot be recovered.

A Note on Baseline

The RHR and HRV figures that emerged from this period, 39–41 bpm resting, HRV consistently in the 50s, became the baseline against which the threshold sparring data was subsequently collected. That context matters for interpreting those findings. A system arriving at high-intensity work from a well-regulated baseline behaves differently from the same system arriving depleted.