Body Part Twister is great for getting people working together and energised, it is physical and needs participants to be comfortable leaning on each other.
Call out different body parts, these are the only parts of the body the whole group can have touching the floor. Encourage everyone to work together to find a solution and balance on each other if they need to. For example, to a group of nine people you could call out four bums, two feet, one head, two hands, four knees. Call out the next set of instructions as soon as everyone is in position.
Just remember to think before you call out combinations or you could call out something that is physically or numerically impossible!