Would exercising make me smarter?

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No. The only way to get smarter is to eat lots of branded fast food and read Neil Degrasse Tyson

Nice dubs.

I know I was definitely smarter before I was morbidly obese. So, probably.

I hacked this user's webcam and took a pic.

Hilarious.
I'm a man. And also nowhere near that fat. She looks like she's too fat to walk, whereas I'm still fit enough to run at a reasonable pace, but also fat enough that it kind of hurts.

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Now that looks a great deal more accurate. Well done.

what did your pic have to do with my post man

Well, you do get better at exercising.