50 Miles in the El Paso's mountains? In December, when the cold really bites you? Why not? And some of them even enjoy it!!! http://www.elpasopuzzler.com/

Chupacabras is one of the most strenuous cycling competition that exists. The 100 kms. of the race takes a really good tall of the racers, specially in the mountain part of it. https://www.facebook.com/CarreraChupacabras/