A Club Fat Ass run featuring rolling urban trails. 10k, 25k, 50k. More info at http://www.clubfatass.com/events/muthasnature. Free for members of Club Fat Ass. Annual membership includes a cool technical club shirt, access to a wide variety of club runs and speaker events, contests, a vibrant online community, new friends and loads of fun. Join here: http://www.clubfatass.com/join.