The original sketch was done by reynard86 as a request I made during FA's down time.

You can see the original here: http://www.furaffinity.net/view/1437771/

I like it so much that I colored it.
I tried a new technique with it, this is the first time I've used my tablet to do lines like this.

Razor has to work out constantly to maintain his heavy build, he lifts 40 tons with each arm daily, along with a whole other set of workouts to keep himself fit. Including wing workouts to maintain his flight capabilities.