Why Your Easy Runs Suddenly Feel So Hard After 50

Study referenced: https://link.springer.com/article/10.1186/s12967-021-02737 1#:~:text=Nevertheless%2C%20recent%20evidence,a%20younger%20adultYour pace hasn’t changed, but suddenly your heart rate is climbing and your easy runs don’t feel easy anymore.Is it age? Lost fitness? Your watch? Or something else entirely?Lindsey Parry & Shona Hendricks break down what your heart rate is actually telling you after 50, the mistake many runners make when they see it rising, and what you should change before you simply start running slower.