Okay kiddo, so Lombard's Paradox is a fancy way of saying something that seems a bit weird. Basically, when we exercise, our bodies get tired and we feel like we can't do much more after a while. But then, when we start playing some really cool music or people around us start cheering us on, suddenly we feel like we have more energy and can keep going for longer!
It's like when you're running around in the park and you suddenly see your friend on the swings, and you want to go play with them. Even though you were getting tired before, now you have more energy to keep playing because swinging on the swings is so much fun!
This paradox can happen because our brains and our bodies are connected. When we do things that we really enjoy, our brains sometimes release special messages that tell our bodies to keep going, even if we're tired. So next time you're feeling exhausted and need a bit of a boost, maybe try listening to your favorite song or thinking about something that makes you really happy, and see if it helps you feel energized again!