You may actually do a non-disturbing thing. You can make an eye contact with the woman whenever possible and shoot a fast and friendly smile without saying anything since she is on her i-pod and can't hear you. If you get a return look from the woman, then this would be a good timing for you to play your skills. You also need a lot of patience because there are women who give the impression of putting off through interruption into their workout zone. So, if possible, put some little barrier first in order to set up a possible move later on.