Hold on tight because if Earth's gravity suddenly decided to hit the gym and bulk up, it'd be like living in a whole new world! First off, forget about jumping; you'd feel like you're trying to leap through molasses. And don't even think about lifting anything heavy; it'd be like trying to bench press a small car. Walking? More like trudging through quicksand with each step. On the bright side, you'd definitely get a killer workout just going about your daily business! And flying? Well, say goodbye to that dream; even birds would struggle to take off in this heavyweight world.