<qa>  What is the short version of the International Physical Activity Questionnaire?- Sedentary lifestyle: the following serve as non-strict guidelines: Low category of activity according to the short version of the International Physical Activity Questionnaire IPAQ; VO2max ml.kg-1.min-1 below: 45 - AGE yrs 3 corresponding to a fitness category below fair i.e. poor or very poor as defined by Schvartz and Reibold. For example for an 18 year-old male, VO2max below 39 ml.kg-1.min-1. 