Ansin can mean "there, in that place" or "then". Duolingo have taken it to mean "then" in this exercise.
One scenario is where I might be talking to you about my training methods.
Me: "I do some stretches first".
You: "Do you run then?" meaning do I run after having done the stretches.
Another scenario is where you ask a child:
Question: "Do you walk to the shop?"
Follow-on question: "Do you run then?" where you are offering an alternative given that the child doesn't walk.
Does it have to do with time? I think it might mean Do you run (after some other event has occurred)?