SF Weekly has a nice link to this interesting event for hikers and yoga enthusiasts:
Eric Kipp may be brilliant. Without a doubt, the spirit of San Francisco itself pulses quickly in his veins, because he is the creator of Hiking Yoga. It’s exactly what it sounds like; you follow the charge up one of our butt-bustin’ hills, and once you’re up there, the organizer/sherpas hand out mats and water, and you do some yoga. The courses are chosen for their vistas as well as for their challenges: City-proud fitness nuts, prepare to fall in painful workout love.