A big international study has shown that regular exercise helps people with colon cancer live longer. The study followed 889 people from Canada, Australia, the United Kingdom, Israel, and the United States who had finished chemotherapy. The study was published in the New England Journal of Medicine. It found that people in a three-year exercise program had 28% fewer cancer problems and 37% fewer fatalities from any cause. The program gave help every two weeks for one year, and then every month for two more years. The goal was to help people exercise more. Many walked for 45 minutes several times a week. The results were shared at the American Society of Clinical Oncology (ASCO) meeting in Chicago. Experts said this is the first study to show that exercise can help stop cancer from coming back and help people live longer. Dr. Julie Gralow from ASCO said the study gives strong proof for earlier ideas. The study also took blood samples to learn how exercise helps, like controlling insulin and helping the body fight disease. Experts think that exercise programs should be part of cancer care.