Possible Clues:

• Reluctant agreement to get extremely fit
• Thriving, or just OK?
• Rude health? Okay, if that's how you want it!
• In excellent health, I agree
• Enjoying great health? Yes
• Okay, if that's how you want it? Sounds like a diagnosis you'd want to hear from doctor!
• Expression of consent
• "Okay"
• As fit as a fiddle? Yes, I suppose so
• Kind of light setter and solver will okay!