The biggest benefit of exercise is not weight loss. Exercise has many important benefits to your health. The most obvious health benefit is cardiovascular and pulmonary. (Heart and lungs) Another important benefit is to increase your muscle mass which improves function.
The benefit to weight loss is not only that you burn a few extra calories. It is also that you build muscle mass which will increase your metabolism. (Your body's maintenance calories needed will increase).
Another benefit is that you get to eat more if you choose to. I like this one.
If you don't choose to eat more, you will lose weight faster. My hypothesis is that eating a certain amount of calories (say 1800 a day) and burning 500 calories a day in exercise is NOT the same as eating 1300 calories a day because reducing your calorie intake actually slows down your bodies metabolism where eating more and exercising will not have the same effect on your bodies metabolism. In other words, you get the benefit of taking in a net of 1300 calories a day while your body needs 1800 where without the exercise your body may get to the point where it decides it only needs 1500 calories and your weight loss will slow down.
Why do you say O Jacob and complain O Israel, "My way is hidden from the LORD, my cause is disregarded by my God?" Do you not know? Have you not heard? The LORD is an everlasting GOD, the creator of the ends of the earth. He will not grow tired and weary and his understanding no one can fathom.
He gives strength to the weary and increases the power of the weak. Even youths grow tired and weary and young men stumble and fall, but those who hope in the LORD will renew their strength. They will soar on wings like eagles; they will run and not grow weary, they will walk and not be faint.
Isaiah 40:27-31
SW: 183
CW:158
GW: 135-140
final goal: to look good in a bikini, to be strong, firm, and healthy, to be a good example to my children and patients,
to be at peace with food - to eat when hungry and stop when satisfied and to have my mind full with other things other than food when its not time to eat. Eventually I want to live thin naturally and not have it be a struggle.