Michelangelo's David may have been content with nothing but his sling, but The Guardian claims he really needed a Pilates workout. Among the evidence:
Poor posture and flexibility
Right side not straight
Sitting into hip, lower back pain
"Clawed' toes"—weak foot muscles
Incorrect weight distribution
David's posture may be bad, but here's a QuickTime movie of TV's Goliath getting a pretty thorough back exercise.