In a wristwatch imagine the battery is in the strap and there's a medical sensor in there connected to the internet. If someone is monitoring that they could phone up if the user has forgotten to take some medication. This could save hundreds of dollars in medical fees later. What's missing? It's a stable battery.
If you have only one passion in life - football - and you pursue it to the exclusion of everything else it becomes very dangerous. When you stop doing this activity it is as though you are dying. The death of that activity is a death in itself.