Children like to run around. When you're referring to a two year old, a two year old definitely likes to run around. They are just now able to run, and explore their environment, but sometimes it can cause a problem. For example, are they always running around, and running away from you?
Whenever there is a safety concern, it's very important that you set limits with your child. You must explain to them never to run away from you, so that you're not able to get them in time. Especially living in the city, living in a place where there are streets and there are cars. You know, it can be a dangerous place out there, and you want to make sure that your child knows never to run away from you.
If your child is running around in circles, or seems to be kin of doing some rhythmic running, or they seem to be doing the same thing over and over, it could be that they're seeking a certain input.
If they're seeking this movement that they need and they seem to be better attending to a task after running around, it could be that they have a sensory processing disorder.
What's important is to observe their behavior,to take note when this behavior happens, and be as descriptive as you can when you're writing down their behavior, and to discuss it with your child's pediatrician.
If it is in fact a sensory processing disorder you child may benefit from occupational therapy to help address their sensory needs.