Minute to win it Olympics event

Today me and my group done three of the Olympics event. There were "Office domino's,Stack attack and Back flip." The hardest Olympic event was Stack attack no one went through that challenge. Back flip and Office domino's were easy. Some people fail and some people have completed it.  To play Back flip you only need 12 pencil's. Next you have to put the pencil's on top of your hand and you need to flip the pencil to your hand at the bottom. Do that repeated in 2's until you get up to 12. To play Office domino's you going to get books to make domino's. The books have to lead at the bell or something that will ring. To play Stack attack you need a lot of cups to stack. Once you stack it you have to puck the cups down. All of the challenges have to be completed in 1 minute.