我喜欢运动。

Use it just like the English version. Place it after a greeting when sharing interests. You can add adverbs like 非常 (fēi cháng - very) for emphasis. Say 我非常喜欢运动 if you are a gym rat. It works as a standalone statement. It also works as an answer to 'What do you do for fun?'.

Use it during a first date to seem energetic. Use it in a job interview if the company values teamwork. It is great for small talk with neighbors. Use it when someone invites you to a hike. It is a very 'green flag' statement in China. It suggests you have a positive, 'sunny' personality.

Don't use it if you only mean 'I am moving'. 运动 refers to physical training or sports. If you are just walking to the fridge, this is too heavy. Avoid it if you are being extremely specific. If you only like football, say 我喜欢踢足球. Using the general term might lead people to invite you to a 5 AM marathon. Be careful what you wish for!

In China, 'sports' has evolved quickly. Older generations focus on 广场舞 (square dancing) or Tai Chi. Younger generations are obsessed with the gym and badminton. Saying you like sports aligns you with the modern 'healthy China' trend. It is a sign of a disciplined and modern lifestyle. It is often associated with being 阳光 (yángguāng) or 'sunshiny'.

If you want to sound more casual, say 我爱运动 (I love sports). If you want to be specific, replace 运动 with a sport name. You can also say 我是个运动达人. This means 'I am a sports expert/enthusiast'. It adds a bit of flair to your self-introduction. Just make sure you can actually back it up with some muscles!