How did WHOOP warn Jason Calacanis about his health before going to the ER?

Jason Calacanis said his WHOOP showed his respiratory rate about two breaths above normal and his skin temperature elevated for two days in a row, with no other symptoms. When chest pains started that Sunday night he went to a heart center in Austin at 1 a.m. and stayed until 7 a.m. Tests showed inflammation around his lungs and chest rather than a heart attack. Three years earlier a similar spike led him to test for COVID early enough to get Paxlovid the same day.

• Will Ahmed noted that respiratory rate normally barely changes, so a two-breath rise is meaningful.
• Ahmed shared member stories where abnormal sleeping heart rate preceded a stage four Hodgkin lymphoma diagnosis and an HRV drop from about 100 to 50 preceded testicular cancer.

Source: our own transcription of the episode. The full conversation is on All-In with Chamath, Jason, Sacks & Friedberg (2026-10-29). Read the whole episode summary →

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