Dr. Izadi is a certified fitness trainer from International Sport Science Association. She sends her patients to centers to do Vo2 Max in order to evaluate the fitness level and write a prescription for exercise ( personalized plan) based on the parameters provided through Vo2 Max. There are numerous research done to show the benefit of performing Vo2 Max to more precisely design the fitness plan. Dr. Izadi encourages her patients to hire a personal trainer but it would not be absolutely necessary in order to participate the program. Using the prescription for exercise as a guideline as well as different electronic devices to monitor the progress would be sufficient.