He’s wrong. There is a weight loss saying...”You can’t run away from your fork”.
A typical adult man will burn about 500 calories running 3 miles.
Between getting ready to run, finding a place to run, running itself, showering after running, etc...this process could take 2 to 3 hours per day. It would be a heck of a lot easier just to get a regular black coffee instead of a Caramel Frappuccino at breakfast or carrots instead of large fries at lunch. Make both substitutions and it is the equivalent of running 6 miles a day.
I’m not saying that exercise isn’t important. I run 10 to 15 miles a week. It has many great health benefits. Lifting weights is great for bone density and hormone regulation.
But...you just can’t run or lift yourself from fat to skinny.
Yes, what you said...I believe moderate exercise can be really good for you, but isn’t necessary if you do not lead a SEDENTARY life....ie sit on your bum many hours a day. Put an odometer on yourself...do at least 10,000 steps. It does make a difference, BUT, it wasn’t till I quit most carbs that I lost 20 lbs.