Which coworker stresses you out most? This WHOOP user built a stress leaderboard

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Every workplace has its share of stressful personalities. If none of your coworkers come to mind, there’s a chance your colleagues have you on their list instead. One WHOOP user put that exact idea to the test, using wearable data to uncover the biggest sources of his workplace stress. The results were both amusing and surprisingly insightful.

By combining data from his WHOOP fitness tracker with his work calendar, Pankaj Tanwar created a system that identifies which colleagues are most closely linked to spikes in his heart rate. This eventually led him to a personal “stress leaderboard” that ranks coworkers based on how much stress they appear to cause during meetings.

He shared the experiment on X, posting a screenshot of the leaderboard while wisely keeping everyone’s identities hidden. The dashboard breaks down meetings using metrics such as heart-rate increases, stress scores, and cumulative impact over time.

According to Tanwar, the project was powered by Claude’s new Fable model alongside some custom code. To make it work, he reverse-engineered parts of WHOOP’s system to access minute-by-minute heart rate data, something the wearable doesn’t normally expose to users at that level of detail. He then cross-referenced those readings with calendar events and attendee lists to identify which meetings consistently coincided with elevated heart rates.

The leaderboard doesn’t just single out potential stressors. Some coworkers appear largely neutral, while others are associated with calmer readings, effectively earning a reputation as the office’s stress reducers. It all turned a simple collection of biometric data into an unexpectedly entertaining snapshot of workplace dynamics.

Naturally, there are plenty of variables that can affect heart rate beyond a particular coworker. A rushed walk to a meeting room, climbing stairs between floors, an extra cup of coffee, or even a sugary snack could all raise readings. Several commenters noted that physiological data without context can only tell part of the story.

Even so, that’s not really what makes this experiment interesting. The leaderboard probably isn’t a scientifically rigorous measure of workplace stress, but it is a creative example of what can happen when wearable data, coding skills, and AI come together. While conversations around AI often focus on productivity or job disruption, projects like this show another side of the technology: helping people uncover patterns in everyday life that would otherwise go unnoticed.