给定一段英文对话，将其翻译成中文。
John: Hey, what are you up to?
Mary: Not much, just watching TV. How about you?
John: I'm thinking of going for a run.
Mary: That sounds like a good idea. maybe I'll join you.
约翰：嗨，你在干嘛呢？
玛丽：没什么，只是在看电视。你呢？
约翰：我想去跑步。
玛丽：听起来不错，也许我会和你一起去。