Richard Rodriguez from the United States is a great roller coaster fan. Recently he broke his 15th world record after he spent 104 days riding the world's largest roller coaster. "It got more difficult to ride and ride because of the muscle tiredness," Rodriguez, a teacher at the University of Chicago, said as he stepped down from the ride in a German park. He spent 10 hours a day on the roller coaster. Rodriguez tried to keep himself busy during the rides on the big roller coaster in a southwestern town in Germany. "I read the newspapers...I have a walkman, I have my cellphone, so I try to talk to people and message people during the day," he said. Although the 42yearold said he felt sick on the first few days, he said he soon got over the problem. "My face hurts sharply and I have a little backache, but I am good." The "Expedition GeForce" is one of the world's biggest roller coasters. It measures 62 meters at its highest point. On his 95th day on the coaster, after travelling over 25,000 kilometers, Rodriguez had a toothache and was treated by a local dentist. He went on after that and succeeded in breaking the record. Rodriguez celebrated with members of the park staff and his supporters, who had sent him postcards and emails encouraging him not to give up. During the roller coaster ride, Rodriguez   _  .
kept on working as a university teacher kept enjoying good health kept in touch with the world around him broke his world record 15 times