"The word aerobics came about when gym instructors got together and said: If we're going to charge $10 a hour we can't call it Jumping Up and Down."

The quote is from the very funny Rita Rudner.

The reason I'm using it here is to let you all know I joined a gym.

And like Rita I also found that

They call it Pilates because they can't call it 'The Stretching Rack' class.

and

They call it Zumba because they can't call it 'Jumping around to Latin Music' class

and I also asked myself

Why do I drive 20 minutes to the gym so I can walk on a treadmill for 30 minutes?

Actually I'm having fun and though I've only been going a little more than week and a half - I can now walk up a flight of steps without keeling over in a desperate attempt for air.