Cauthen, Desormeaux, Ouzts, Bourque, Parker, Migliore, Delahoussaye and Baze all have one thing in common-perhaps several, if we are splitting hairs. They all started from the ground up: mucking stalls, grooming, walking hots. All too often nowadays, young upstarts are appearing and eschewing the shank for the helmet, goggles and jock's license, which is why it's so refreshing to spend some time with up-and-coming apprentice jockey Diego Herrera. Zoe Cadman visits the 17-year-old at Los Alamitos Racetrack.