Since genetics, their current fitness condition and training experience would be different for every athlete, there cannot be an optimal training volume for each athlete. It would also be unwise to claim that, “12 hours a week should be enough for a 4 W/kg FTP” . The overload is not known as shocks of stress, rather it is more how over a period of time, a number of these are applied. In practice, this probably means that the general advice would be, ‘try to improve on last week’s training load’, and that successive progressive overloads, which are weekly and bi-weekly, would take time of around thirty minutes to one hour. All these factors are going to be case specific for every individual.