roguedog, what you're seeing is a lack of body fat. most pro cyclists have a lot of muscle definition because you can "see" their muscles -- no fat obscuring the view.
but, besides that, you do need a strong core and upper body to ride well. but there's a fine line between being loose and relaxed on the bike (I describe it to clients as being like an al dente noodle -- loose on the outside and firm on the inside) and being too tense.
a relaxed upper body will allow you to respond to changes in terrain (bumps, potholes, obstacles) and will help you ride comfortably for long periods of time.



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