[s1e1] Stress-proof -

A method used by first responders involving inhaling, holding, exhaling, and holding again for four seconds each. This triggers nerve fibers in the chest to signal the brain to "chill out".

Hemsworth's hands and feet are bound while he is shoved into a pool. He must perform underwater exercises while managing his panic and breath. [S1E1] Stress-Proof

Hemsworth undergoes three primary "stress tests" to practice these techniques: A method used by first responders involving inhaling,