What should I do about this kid in school?

There is this kid in my grade who every time he sees me doing push ups during recess, he asks me how much i can bench press. I don't know how much i can bench press, so i tell him that i don't know. He brags about how much he once benched 350 lb, which i doubt because i know that no student in the school is that strong. Also, I don't really lift weights. I just do push ups, pull ups, and crunches.