What I really struggled with was the cold and snow that resulted in long training runs on the treadmill. (runninglovingliving.com)
I only wear three pairs or so and have never won a race in any of them, but for reasons which passeth understanding, I am unable to discard the rest of the worn - out, sweat - stained shoes that bore me faithfully, if foolishly, on long training runs and races from a mile to my usual run - and - walk marathon. (si.com)
For endurance athletes, however, and many team sport athletes (who may be engaged in long training runs or rides, long practices, etc., and may not have an easy time taking in large amounts of high protein whole food before, during, and after activity), BCAAs can be tremendously useful. (completehumanperformance.com)