In the gap between the international games and the return of the Premier League, Ant McGinley, Joel Tudor and Marley Anderson find themselves discussing health, the environment and physics, all through football. Firstly prompted by a meeting happening today which is expected to lead to 5 substitutes being the norm from next season, they ask if there is any argument for keeping it at three, and if they do change, why stop there? We expect that Manchester United flying out to Australia pre-season will generate a lot of criticism in terms of a carbon footprint, but in terms of the brand, and the opportunities for fans to see their favourite teams, is this going to become a regular occurrence. And with the ball for the World Cup in Qatar being revealed, we wonder just how much science can go into a ball, and take a little nostalgia trip to discuss some of our favourites. Learn more about your ad choices. Visit podcastchoices.com/adchoices