Because there is no crying in running...
I might have used Icy Hot once or twice to get through a run... and by might have I mean I definitely have... and by once or twice I'm referring to a week. Yes, Icy Hot helps, and last summer I confirmed that it wasn't necessarily in my head. However, is Icy Hot the best? Probably not, but it is among the most convenient. Nonetheless, here's a Runner's World review on the topic!