One of my favorite team building exercises to have my student do is the magic carpet.
Needed Materials:
Start by telling the entire team to stand on the blanket/tarp. No part of any body can be directly touching the ground.
After everyone is on, tell them that you realized the instructions to fly the carpet are on the other side of the blanket.
The task is to flip the blanket over without anyone touching the ground.
It works great for teaching communication skills, delegation, and is very physical. Plus the team gets really close (literally). Even if they don't succeed entirely (which is possible based on the size of the blanket/tarp compared to the number of people) they will likely manage to reduce the size of the blanket they are standing on in half. If they don't succeed but reduce the standing area, highlight how much they grew as a team even by doing that, since odds are they struggled a bit in the first place to fit everyone on the blanket with the entire area.
**Remember the key to success for a good team building exercise is a good facilitator and a period of reflection. Without a summary to the lesson, often the time is wasted in the long run.