We can't out train the fork - correct, and improving exercise minutes would generally hold a greater degree of energy expenditure compared to physical activity - correct but physical activity/ (NEAT) non exercise activity thermogenesis is a key factor to a fat-loss phase. During a fat-loss phase we are aiming to change body composition (lose fat) or in simple terms move our body from weight set point A to weight set point B. Implementing habits that consist of physical activity (steps, etc) helps our body adjust to the 'NEW' weight set point (weight homeostasis). It also in most cases helps us get out of the office or the house to clear the head, refresh and get some much needed vitamin-D in (on the good days, LOL). It also can be seen as a less strenuous way to increase a clients total daily energy expenditure without having to add more stress to the body (increased heart rate during exercise). A general goal would be to optimise 70,000 steps over the course of a week.