I swim every morning before work.
I wear a cap and goggles and I use wrist and ankle weights to give me more resistance. I try and do 100 laps in half an hour which means I go fast and don't stop. What I'm trying to say is I'm a strong swimmer, I look "serious" and it's clear I'm there for exercise not to have a gentle saunter up and down.
Yet, nearly every single morning someone will interrupt me to comment on my speed or ask about my weights. Now, it's very nice that people take an interest and are often complimentary but it does my bloody head in. Most people strike up a conversation when I'm having a brief rest at one end of the pool but even though I'm technically stopped swimming, I'm still in the "zone" and carefully time my rests so.
This morning, a woman who was swimming with her daughter asked me how her daughter could improve her technique. I briefly told her then made it clear I was setting back off. Then the cheeky bugger asked me to show her daughter how to do it and told me I wasn't very kind when I said "no".
"Leave me the fuck alone" might be the route I go down next time this happens but I'd welcome other "fuck off" synonyms.