To run or not run? Better run but not run too much.
Basically, some scientists separated mice into groups of active, overactive and lazy mice. Actually, forced the mice to be active or superactive. Then they exposed those different groups to a flu virus. So what they found were the overactive and lazy mice succumbed easily, only a handful of the active mice were affected.
They interviewed (human) marathon runners and found that one-fifth usually fall ill 3 weeks before or after the race.