Measure of overall physical activities Physical activities performed outside of training session will be recorded using the long form of the International Physical Activity Questionnaire (IPAQ). The IPAQ has been very widely used in studies of physical activity across different ages and medical conditions (http://www.ipaq.ki.se/publications.htm). The IPAQ records the types, frequency and duration of physical activities across 4 activity domains including leisure time physical activity, domestic related physical activities, work-related and transportation related physical activities. The IPAQ yields scores for walking, moderate-intensity and vigorous-intensity activities with each of these activity domains. A total score is calculated by summing the duration and frequency for all types of activities across all domains. This score will be used to account for the potential confounding effects of physical activities performed outside of training session in both groups.