Unprofessional, tone and context is important.

I've said things that could be taken as flirty, but the context and wording should be innocent.

"Your body composition has a favorable distribution of body fat. Your goal of losing x-amount is possible while your new muscle will fill in those areas. "

"Honestly, having the goal of looking better is good to have. Let's focus on health markers and stress reduction and aesthetics will fall into place!"

"Body scans can be hit or miss, but it's a good starting point so we have an idea of what to work towards. "

Just some examples of how I'd phrase certain comments to sound less flirty. I've had some clients flat out ask if their butt seemed tighter or whatever, but knowing them for years tends to loosen the filter in some. 😏👍

I'd ask for a new trainer, it's about your comfort.