We play chase... our house not only has a circular layout, but a figure 8!!
We play airplane and tackle daddy where dh sits in the floor in the LR and calls their name and they tackle him and tell him whether or not they want to do airplane (which always seems to hit turbulence and crash) or to be thrown onto the couch (or mommy)
We dance, play twister, simon says, mother may I. They got a mini trampoline and a balance beam that's about 6" off the floor, so they do obstacle courses with that. We play balloon ball....
Oh, and until pictures start falling off the wall we play dodge ball at the stairs... the kids are at the top and me and DH are at the bottom... we throw the balls back and forth with them trying to get them downstairs as quickly as possible and us trying to get it in the bathroom at the top of the stairs.
They also slide down the stairs racing each other and jump from the bed to the floor (we don't allow jumping on the beds anymore since the 2yo has learned what they are doing... she knocks the others off)