關於健身的英文作文可以參考以下內容：
標題。Running—My Favorite Sport。- 內容。Running is a great sport for keeping fit and relieving stress. It's easy and convenient for me to do. I can run in the morning or after class, and I can even run alone without needing a partner. Running has become a part of my daily life, and I always feel good and relaxed after a run.
此外，還可以參考以下內容：
標題。Yoga—An Important Part of My Fitness Routine。- 內容。Yoga is an important part of my fitness routine. It not only increases my flexibility but also helps me lose weight.
還可以參考以下內容：
標題。Fitness—The Key to a Healthy Life。- 內容。Fitness is important for a healthy life. It's important to find an activity you enjoy in order to stay fit.