Yes, there is light physical activity during the game prep and the game itself.  The low challenge level is such that an average person can fully participate and have a great time.  A person may still participate if they have physical impairments as there are a variety of challenges during the battle, many of which are not physical in nature.  If any activity comes up that a participant does not feel safe to engage in, they are encouraged to take care of their body!  They may become an observer during that portion.