Training course. Practice

I was at a training course today with my team, about being Persuasive. It was later in the second day, and I tried out one of the methods. Label someone, then wait for a reply, so when most were on the break, I said to the presenter, "I noticed that you seem to keep so very fit, what is it that you do, to do that"?

Then they paused, and told me, Gym 3 days a week and a casual gym membership so it's not onerous ".

I was also really interested, as had been asking my work mates the same question. Recently had a heart scare so am trying to fix it before it's an issue.

After the session, my upper manager said to me that comment is too personal and could be viewed as inappropriate.

I want to hear your thoughts on this. Guys and gals.

For context I'm in my early sixties, and haven't been told this before.