I found this site that helps a lot for character development. 

Screw Googling BMI for an accurate weight. Use photos of real people, organized by height, weight, and body type: 

[url=http://mybodygalleryformen.com/]For males[/url]
[url=http://www.mybodygallery.com/]For females[/url] 

For example, I typically know how tall my characters are. But I often have trouble deciding on a weight. So I search a height, guess a weight, and repeat until I find a body type that matches my character's. Then I use those measurements.