Possible Clues:

• Exercise system intended to improve one's posture
• In error, Greek character backing exercise system
• System of exercises I discovered in full-page book illustrations
• Holistic system of physical exercises
• Upset Ali, passing over boxing exercises
• Exercise system intended to stretch muscles
• Exercise hard, a cheek aloft
• Current learner absorbed in head's system of exercises
• Exercise system — various courses about one
• Biblical villain's exercises