Dan EnglandThe Colorado Sun Michael Mitchell records a video for his TikTok account at North Table Mountain on June 15, 2023, in Golden. Mitchell, a gay ultrarunner, has become a running influencer on the social media network, attracting more than 87,000 followers.Hugh Carey/The Colorado Sun When you go through his TikTok account, Michael Mitchell could be held up as an example of what happens when you spend too much time at high altitude.  The videos show him carrying his slim, tan figure and wholesome, golden haircut up steep trails as fast as most of us walk a sidewalk in downtown Denver.