An elite endurance coach explains how to boost a key metric for longevity with the 'Norwegian method'

Olav Aleksander Bu, left, is a renowned coach to elite athletes such as Norwegian triathlete champion Kristian Blummenfelt (right).

Courtesy of CORE/Santara Group

• Olav Aleksander Bu is an elite endurance coach whose training balances intensity for better results.
• You can use his strategies for better VO2 max, a key metric of fitness and longevity.
• Understanding factors like heart rate, threshold, and heat can help you work out smarter.

For Olympic triathlete gold medalist Kristian Blummenfelt...