Cross-country skier going across terrain (IMAGE) Norwegian University of Science and Technology Caption New research shows that energy expenditure for cross-country skiers increases on uphills during long-distance skiing. Photo: Trine M. Seeberg Credit Trine Margrethe Seeberg Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.