I was searching this post since the muscle mage debate started, finaly i found it. :D
Its a short but interesting read about mages and physical fitness.
Its from the Steve Jackson Games forum, from the user D10000, enjoy:
Sorry for the text background color but I have no clue how to change it.
Myth v. Stereotype, or "My Wizard Wears Plate and Has a 14 Strength"
In another thread on plate armor and spell casting I got off on a Semi tangent relating to magic user stereotypes and their conflict with magic user's in pre-D&D fantasy (this also overlaps and parallels Elves).