Also, it's not like if you eat less and don't exercise you'll drop 25 pounds immediately. That's going to be incremental, so you may as well gain a little fitness while you do it.
Yikes, so below are some excerpts from Time's article "Why Exercise Won't Make You Thin": http://www.time.com/time/
What's going on here? Church calls it compensation, but you and I might know it as the lip-licking anticipation of perfectly salted, golden-brown French fries after a hard trip to the gym.
"If you're more physically active, you're going to get hungry and eat more." Gortmaker, who has studied childhood obesity, is even suspicious of the playgrounds at fast-food restaurants. "Why would they build those?" he asks. "I know it sounds kind of like conspiracy theory, but you have to think, if a kid plays five minutes and burns 50 calories, he might then go inside and consume 500 calories or even 1,000."
Uhhhh they build those so kids can have fun, play, you know, do kid stuff. Also, have you known anyone to burn 50 calories in 5 minutes???????
And wouldn't McDonald's prefer if you bought 1,000 calories of food for the little one??
We all need to move more — the Centers for Disease Control and Prevention says our leisure-time physical activity (including things like golfing, gardening and walking) has decreased since the late 1980s, right around the time the gym boom really exploded. But do we need to stress our bodies at the gym?
Actually, it's not clear that vigorous exercise like running carries more benefits than a moderately strenuous activity like walking while carrying groceries.
What kind of benefits are we talking? Running will better prepare you to run a race or escape a tiger than carrying your groceries will.
It's what you don't eat, not what you eat too much of because you think you've earned it. And most people don't exercise to "work it off" but to "work out." You shouldn't have a postexercise reward, you should have a post exercise refuel.
Besides, fries and gatorade - not part of a diet that helps you lose weight, regardless of whether you work out or not.