answer: Michael's taking a walk to get exercise. #Person1# invites him to play basketball.
documents: #Person1#: Hey Michael. Where are you going?
  #Person2#: No where special. I was just taking a walk.
  #Person1#: What for?
  #Person2#: To get a little exercise. I'm so out of shape.
  #Person1#: Hey, I play basketball with a bunch of friends twice a week. It's great exercise and it's fun too. Why don't you come out and play with us?
  #Person2#: That sounds great. Give me a call next time you guys play.