Physical fitness means having a healthy body that works well. It means having strong muscles and bones, enough energy and endurance to do activities like running or playing sports, and good mental and emotional wellbeing. To be physically fit, you need to do things like eating healthy and nutritious food, exercising regularly, getting enough rest and sleep, and taking care of your body. These things help your body stay strong and healthy so you have the energy and strength to do the things you like doing.