Your legs feel like fried bacon after a day of climbing and descending. It's a roller coaster ride, but no one is pulling you up the mountain. You're headed toward Yosemite more than 4,000 feet of pounding the pedals. You are aware of every movement because your thighs feel tender with a sensation of pain. You push on, toward the final ascent into the valley. In front of you is a monster mountain-El Capitan. Your eyes grow wide. You take a deep breath. Suddenly, you feel only wonder.