I took a VO2 max test while sprinting on a treadmill. It taught me how fast I should run to burn fat and build muscle.

Tech Insider : Business, Technology
The author is running on a treadmill
I wore a mask to track how hard my heart was working during strenuous exercise.

Corrie Aune for BI

A cardiologist shared 4 seemingly healthy habits that can lead to heart failure, from too much protein to overdoing workouts

Tech Insider : Business, Sports
A man pouring a protein shake from a blender
A super high-protein diet can lead to inflammation, a cause of heart disease.

Prathan Chorruangsak/Getty Images

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