Positive effects -
•Education - People learn the rules of the sport usually from watching it on the tv.
•Coaching - Watching professionals on tv can help you see how a technique should be performed which can help your performance.
•Role Models - Seeing good sportsmanship on tv makes them a role model for other people to look up to.
Negative effects -
•Bias - Usually, only the popular sports get all of the attention, which doesn't help other people into the less popular sports.
•Less Attendance - For games that are often shown on tv, ticket sales drop.
•Attention - Professional sports players often complain of too much attention being pad to their private lives.
•Demands - The media can put lots of pressure on the organizers on sporting events to make TV viewing even better.
Hope that helps you!!