Cold Water Insights
Cold exposure is more manageable when entering water quickly and completely, as it reduces discomfort by minimizing the relative temperature changes perceived by the body. Submerging the shoulders and activating the dive reflex can further enhance tolerance to cold. Movement in still water disrupts the thermal layer created around the body, leading to a sharper sensation of cold, making awareness of safety crucial when approaching extremely cold environments.In this clip
From this podcast

Huberman Lab
How to Control Your Sense of Pain & Pleasure | Huberman Lab Podcast #32
Related Questions
Is a specific water temperature the key factor for the benefits of cold plunging, or is it the temperature difference and shock it may cause on the body?
What are some deeper scientific insights into the benefits of cold water immersion?
How do you know if the water is too cold or if you are putting yourself at risk during a cold shower as discussed in the episode How to Control Your Sense of Pain & Pleasure | Huberman Lab Podcast #32 and the clip Cold Water Insights?