Exercise accounts for very little of your total energy expenditure, and it's hard to create a significant calorie deficit through exercise. (businessinsider.com)
One is that when you're first starting out, it's a lot easier to create a significant calorie deficit, at least the initial deficit when you're starting out at maintenance. (completehumanperformance.com)
People with a lower percent of body fat will lose more muscle and retain more fat with a significant calorie deficit. (mediatrendings.com)