A fun but challenging team building game that I use for staff training is where I put all my staff on a log and give them a number...then I tell them they have to switch places with the person that has there same number, without falling off the log (if they fall off the whole group has to start over) and without talking... I usually number 1,2,3,4,5,6,7,8,9,9,8,7,6,5,4,3,2,1. I hope that helps...it is fun! Let me know if you want any other ideas...I love team building activities and know lots of them! ;\)