Jim's a 41 year old dad from Ohio. He's vacationing in Colorado in Breckenridge. He takes his two boys -- age 8 and 9 -- mountain biking for the first time at elevation 10,000 feet. Maybe you've been there.
That reminds me of the time my son and I were mountain biking through the Santa Cruz Mountains and he got a little over enthusiastic during what was supposed to be a short one hour ride.
"Let's go this way," Little Fritz says, pointing downhill toward the San Lorenzo River.
In the best tradition of fatherly advice, I try to discourage him. "Umm, no, it's a rock garden, a river, and then about a thousand feet of uphill before you finally reach some decent trails. It's pretty tough and long."
"It sounds like fun!" responds Little Fritz. "Let's do it!"
Charged by his youthful energy, I go with my son's recommendation and we dive headlong down the trail, through the rock garden, ford the river, go uphill, and ... Little Fritz runs out of steam inside an isolated valley. Downhill isn't an option, because downhill only leads down the valley and through the River, from which you must go uphill again. He's bonked in an isolated valley, and we have little water and no food, so our only real choice is for me to walk both bikes uphill so he rest a little.
We finally make it to the UC-Santa Cruz fire trails, from which we eventually get to Bay Drive, then Pacific Avenue Santa Cruz and Jamba Juice, where we refuel for the arduous trip back uphill to home. We took the bus home from Santa Cruz that day :-)