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June 7, 2017 / Yorba Linda, Calif.

Strength and conditioning coach Sam Calavitta monitors all of his athletes bodily functions from carbon dioxide output to metabolic rate to heart rate to gauge their recovery time and performance abilities. While pedaling on a stationary bike, TJ Dillashaw, left, and Aaron Pico, center, are closely monitored by Coach "Cal," far right. (Melissa Lyttle for ESPN)
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Melissa Lyttle for ESPN
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ESPN | MMA debut
June 7, 2017 / Yorba Linda, Calif.<br />
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Strength and conditioning coach Sam Calavitta monitors all of his athletes bodily functions from carbon dioxide output to metabolic rate to heart rate to gauge their recovery time and performance abilities. While pedaling on a stationary bike, TJ Dillashaw, left, and Aaron Pico, center, are closely monitored by Coach "Cal," far right. (Melissa Lyttle for ESPN)