“I’m going to an aquarobics class in the morning, do you want to come?”

Holiday in Melbourne, and that’s one of the first things your buddy says to you.  George, do you really think I look like the aquarobics type?  I have translucent skin that’s likely to be a sight hazard, I’m uncoordinated at the best of times, and I’m unfit – what if I pass out halfway through and have to be given mouth to mouth by a sweaty lifeguard?