WHOOP Your Personal Digital Fitness and Health Coach
$239

Dr. Andrew Huberman studied three different breathing exercises utilizing WHOOP to help evaluate which exercise was the most effective at improving mood and reducing respiratory rate.

The most advanced fitness and health wearable. Get personalized insights on your body's recovery, strain, sleep, and health with in-app coaching features designed to help you unlock your best self.

https://join.whoop.com/en-eu/huberman
Andrew Huberman gave you 1-month, free. WHOOP 4.0 is included.