The ice on the trail creaked under the sheets-I drilled a metal screw at the bottom of my running shoe, a winter trail.At about 25 degrees in February, the Barr Trail was sunny, at 14,115 feet of one of Colorado's highest mountains, 13 miles of Pikes Peak winds.I was standing at the slope club with other runners a few hours ago and their motto was "try to get out ".Speed up when it gets hurt, "I usually live up to it, but that's not the point.At 8 a.m.Within 10 degrees, we set out wearing hats, gloves and running tights, carrying hydration bags, and the drinking tubes of these bags freeze unless you mix Gatorade together.If the weather is cold enough, it freezes next to your skin even if you cram it into your wool shirt.It's all part of a world away from office and obligation to push yourself into a wild and wild place.The challenge of mountain running connects me with the scenery of various weather and other runners.In the heat of the summer, I was in seconds from the excitement of quickly picking in and out of loose rocks, to tasting the gritty dirt on my tongue, destroyed by the feet tangled in the rock.When I was sitting up, I felt the tingling of the road rash that my tights had torn."Are you okay?A passing runner stopped to ask me.I said, "I think so, but my ribs are hurting ."."They hurt bad."We still have five miles to go, and despite the heat, the runner helped me get back to the trailer head.Whether it's a broken rib, or the kind of game that is hot and altitude that puts me in an oxygen medical tent, or two bags of salt water, a hug, and a high-altitude IV --Five reminders to me on the trail "just a bad day"runner speak.A lot of running is drama.Freedom, rewarded by the deep breath of the scent of pine trees and the loneliness of taking photos of blooming flowers, or catching up with a running friend, where we are happier than at the beginning.I can never be sure what is waiting.As Daniel Coyle, author of the cultural code: Secrets of highly successful groups, said in his podcast work life with Adam Grant, "Our intuition has gone backwards.You can't build trust in order to become vulnerable.It builds trust when you are vulnerable.Being vulnerable together creates intimacy and creates intimacy."But even though I love running with others, especially when you don't know what kind of adventure there will be that day, don't feel so lonely, if no one is free, or I just want to be alone, and I will set out on my own.In the run on February, I ended the race on my own.When I turned around at a popular station, a stream with No Name, about four miles, I had my own trail.As I grew older, I felt fear spreading to my solo run.For years, I felt invincible.Despite the sightings of bears or mountain lions, the unpredictable severe afternoon lightning storm, or none --quite-My injury is fine and I can go out.Now, when I run on my own, I know more about the sound around me.That day, in a mile or so, the silence was broken by birds, and they floated through the leaves in the bushes on my left.Then I heard the branches creaking.I took a breather, looked at it and went on.I was scared but I appreciate that when I started listening to music there were two bad waterfalls that finally convinced me to give up earplugs.I can always hear the sound around me.Even if it makes me wonder what it is.I was surprised by the tenderness of the deer, who carefully ran through or frantically along the path in front of me.I have seen a few big-horn sheep, and put their otherworldly curly heads in with a brush.I used to run in another direction from the bear.what not to do.I almost stepped on the rattlesnake.I run on a high desert trail where I allow a shotgun to hunt pigeons and bypass shells.But the break of the branch scared me.There was nothing on me, so I went on.A few days ago, 31-year-old trail runner Travis Kaufman killed a young mountain lion while he was running on a trail at Mount Matya Park, a few hours north of Fort Collins.Kaufman later said: "I don't think if I had earplugs I would have heard the crack of the stick and turned around, in which case I thought the fight would be very different, just because it might be stuck behind my neck, I don't know how I can get the cat off in this case."Kaufman wrestled the mountain lion, which was later estimated to be between 35 and 40 pounds, and when it was on its back, he smothered it with his foot on its neck.Kaufman asked for more than 20 stitches from his face and claws and bites on his wrist, which the mountain lion caught on his chin.While there are few incidents of mountain lion attacks, the population of the former Colorado mountains has surged into the mountainous suburbs, which means it has become common to see mountain lions captured in home surveillance videos on decks and backyard.The runners also found them.After all, we are in the Lion Mountain country.I have never seen a mountain lion running on the front mountains for 15 years, but that doesn't mean that when I run alone, I sometimes don't look behind me and have a feeling of being watched, or as it says here, "even if you don't see them, you can be sure they see you."It's not comforting, but we live with wildlife in this country.The fear of health keeps us on guard, but does not scare us away."You shouldn't be afraid that animals are there, but you should be aware that they are there," said Cody Weigner, assistant wildlife manager at Colorado park and wildlife park peak area."You should know what to do when you see one."This involves lifting your arm and keeping yourself as big as possible, staying calm and resisting the urge to run away, which can activate their ambush instincts.But it also includes fighting back when attacked, like Kaufman did.I always take the odds into account."For those running alone, if it really matters to you, you are willing to take risks, in fact, there are thousands of people doing this every day, and they are all fine when they go home, "Boulder, Colorado --Says David Barron, a science writer.His book, The Beast in the garden: The True Story of the deadly return of predators to the American suburbs, "records a mountain lion's deadly attack on a high school runner behind the school and an attack on a boulder runner, and how a growing mountain city deals with the mountain lions among them.He warned against running alone."Because if you go with someone else, the odds of a mountain lion attack go from very small to very small," he said .".Even if I know this, I will go out on my own, although I must have a security plan."People always ask me, 'This is all happening to you, you're still running?Nancy Hobbs, executive director of the American Trail Running Association, said he met a mountain lion on the bar trail and was attacked by a German eagle during more than 30 years of trail running."I said, yes, because you gained strength by doing it, and you did not gain strength by not doing it," she said ."."I do think carrying something, going with someone, letting someone know where you're going, going with your dog, all of this stuff is good and should make you feel more comfortable.The fear factor disappeared."If you have this fear and do something to eliminate it, you can go.