https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/dont-let-your-heart-rate-shoot-dangerously-high-during-workouts-how-to-calculate-the-safe-heart-rate-range-for-you/articleshow/88219832.cms
The standard formula for calculating how fast a human heart can beat is done by subtracting the person's age from 2
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