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It took a while for Michele Drake’s two sons, Christopher, 17, and Matthew, 14, to get used to their mom coming home dirt-covered and bruised.
Ms. Drake, 53, is a hard-core downhill mountain biker. The veterinarian, owner of the Drake Center for Veterinary Care in Encinitas, Calif., and co-founder of GeniusVets, a start up that does digital marketing for veterinarians, had dabbled in mountain biking in her late 20s but stopped…