Boosting Focus
Andrew suggests taking a three-minute cold shower or submerging yourself in cold water before doing work to boost focus and alertness. This, along with a cup of coffee and 40 HZ binaural beats, can lead to a productive 90-minute work session.In this clip
From this podcast

Huberman Lab
Focus Toolkit: Tools to Improve Your Focus & Concentration | Huberman Lab Podcast #88
Related Questions
Is it beneficial to take cold showers before a focused bout of work, as discussed in the episode Focus Toolkit: Tools to Improve Your Focus & Concentration | Huberman Lab Podcast #88?
Is it beneficial to take cold showers before a focused bout of work, as discussed in the episode Focus Toolkit: Tools to Improve Your Focus & Concentration | Huberman Lab Podcast #88 and the clip Boosting Focus?
What does Andrew Huberman say about getting in a cold shower for 1 minute and then out for 1 minute for 3 times in the episode "DO THIS Everyday To Master Your Sleep & Be More FOCUSED" | Andrew Huberman & Lewis Howes, and how cold should the shower be?