For Strength, see Dragonball, life energy, etc.
For Dexterity, art seems to get lumped in. Such as that one guy who uses paper with lines all over it that, when folded, creates runes. Or alchemy circles in FullMetal. Or dance/stance flow abilities.
Con is blood magic, rituals of pain, etc.. Alternatively, pure defensive magic in which the user reinforces his body and uses it as a shield, weapon, etc.