A:

I believe that regular exercise is important. Exercise helps us relax. I love jogging in the early morning. I can enjoy the quiet and fresh air.

B:

I think we need to get enough sleep every day. Sleep improves our mental and physical health. I do better in school when I sleep enough.

C:

Sorry to interrupt, but you are missing an important point. A healthy diet is the most important thing because our body is made of what we eat. I have more energy when I eat a lot of fruit and vegetables.