Knowledge: Warm-up before swimming will help the body's temperature to increase so it doesn't go into shock. On the other hand, working out like running, walking and anything that moves the body will benefit to recover from chronic fatigue syndrome.

Conversation:
I have quite a lot of energy, but I know some people just aren't as lucky. Is their a medical condition for being constantly tired?
There is a condition called chronic fatigue syndrome in which people have long-term fatigue in a way that limits daily activity.
That must be awful. I wonder what causes it. Depression perhaps?
I don't think the cause is fully understood.  It could be genetic, could be biological, or it could be psychological.
Well, I guess the medical profession had better get to the bottom of it. It must be destroying people's lives!
I wouldn't know, but there is some evidence that to help chronic fatigue syndrome one must increase their activity.
Oh, I didn't now. I am bit shock to know that. So exactly what needs to be increase so it will help?

Response: Ah. To recover from chronic fatigue syndrome, working out like running, walking and anything that moves the body will benefit.