Exercise tracker for lazy teenager - Which one?

[terie5]

Any suggestions as to how I can motivate my 16 y old son to be more active?
I have a fitbit flex myself but not sure it provides enough motivation/ rewards for technology-savy teenagers.
Is there a fitness tracker out there that perhaps links your exercise goals to some sort of competitive game?

Mine has to run 1.5 miles in 12.5 minutes in order to go into Army.

There is a zombies app for exercising - walking or running.

The best young male athletes I know are almost all footballers. Great if you could find a 'for fun' side that will take all comers.

Can you help him to find a sport that he'd enjoy? Something unusual like climbing or fencing if he doesn't enjoy regular sports at school?