anyone know a city/league for 3 year old youth soccer. Trying to find something to burn off his energy but everything i find is 5 and up.

Lake Highlands does, but this is the last weekend. Started in September.

I believe the YMCA has their leagues with kids starting at 3-yo.

Town North YMCA has a 3 & 4 year age group. My daughter did this and enjoyed it.

Your best bet at this point is indoor soccer as most leagues are preparing to close. I see that you are in McKinney, I know that bluesky soccer center is in Allen I believe. This place here in Richardson shows to have leagues 3 and up:

http://www.dallassoccercenter.com/index.php

There are also programs like soccer tots at many of these places that would likely work perfectly.