How much physical activity do I need? This is a question I have continuously received throughout my career as a personal trainer, and it is a loaded one. The honest answer is that it depends. If we were to get really specific, how much daily physical activity you need is dependent on what your goals are and your current fitness level. Although the exact level is different for every person, there are helpful, research based physical activity guidelines available to make answering this question much easier for the everyday public.