What's That Word: Endurance

I read an article today about how people with learning differences are less physically fit, and more obese, than people without LDs. This is too bad -- physical activity really helps me to relax, feel focused, and manage my LDs.
In the article I came across the word "endurance" and looked it up:
Endurance: 1: permanence, duration. 2: the ability to withstand hardship or adversity; especially: the ability to sustain a prolonged stressful effort or activity: the act or an instance of enduring or suffering.
The sentence where I found it: They performed the EUROFIT physical fitness test battery (a set of nice physical fitness tests covering flexibility, speed, endurance and strength.)
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