Need questions so we can answer it
Depending on the research you find, it could vary. Explain to them that while watching TV is not an "evil" thing, it can have some affects in the youth. Tell them how it can affect the behavior with friends, family and other people whom are around them. In addition you could even as far as mentioning academic success and failure.
He has to cross them and see which is dominant and then there will be the possibility to combine both
1. i would say a horse rider