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.  Also, there is little to no physical contact.  Any physical contact that does occur our be the equivalent of a handshake or less.