These are a few artists I know of that do muscular bodies pretty well. (least in my mind!)

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http://www.furaffinity.net/user/nightterror/
http://www.furaffinity.net/user/knuxlight/
http://www.furaffinity.net/user/sorakirbys/
http://www.furaffinity.net/user/kihu/
http://www.furaffinity.net/user/superslickslasher/
http://www.furaffinity.net/user/alpha0/
http://www.furaffinity.net/user/wolfy-nail/
http://www.furaffinity.net/user/vallhund/

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Hope it helps!

http://www.furaffinity.net/user/tamazukiakiyama/
http://www.furaffinity.net/user/feralise/
http://www.furaffinity.net/user/lingguang/
https://twitter.com/seiryuuden
http://www.furaffinity.net/user/zoharwolf/

http://www.furaffinity.net/view/19572325/

This is a musty old journal.

I should update this...

o3o...*waves hand*