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Fitness Fanatic Jimmie Johnson Was Blown Away by IndyCar's "Physical Challenges"

After retiring from Cup, Johnson started his IndyCar journey in 2021. Even as a triathlete, the 7-time Cup champion was surprised by the physical grind in his first offseason. “My first test at Barber is when I realized the physical requirements and the high heart rate intensity that went with it," said Johnson, who competed in two IndyCar seasons.