Cant remember this movie, it was a vhs

When I was little I had a VHS about fitness/sport/ exercise. The movie was about 2h 30 and started with a man who loved to do exercise and he gather kids all around the world to do exercise with him in order to fight with the kid who did not like to do sport and was eating a lot of junk food so he become a potato. It was a movie that you, as a kid, could participate from at home as ‘in the movie’ they are waiting for you to 'take your equipment". Help please.