Figure 2: Conceptual presentation of the impact of ageing and training on a physiological parameter (e.g. muscle mass). First notice that there is an agerelated linear decline in functional capacity, here suggested to start at the age of 30 years. It is assumed that the maximal attainable benefit of training at any age is 30%, which results in a 'rejuvenating effect' (indicated by the horizontal arrows) of the functional parameter. It can be seen that 1. in relative terms the response does not change, while 2. absolute increment and 3. the maximal attainable 'rejuvenation' with training decreases with age.