If humans could fly, we'd consider it exercise and never do it
When I read the quote on reditt and I literately loled on the thought then after a slight thinking it was clear to me that the thought has some reality in it.
As a human race we collectively has a tendency to neglect our health whenever and wherever we could neglect the healthy habits and adopt the easy way out.
We all know that the walking is good for health but we don't walk instead used motor cars even for smaller distances. We know how cold drinks and smoking could destroy but we still prefer to use them for a short time fix.
I made a quick wallpaper depicting the quote. Now you can give your comments that whether or not you agree with the quote and my logic.