Zac Efron on his surprise for the Final Five gymnasts: They have such heart!

U.S. gymnast Simone Biles has made no secret of her crush on Zac Efron, so when the actor comes personally to Rio de Janeiro to surprise her and her teammates in the Final Five (with the enthusiastic collusion of TODAY’s Hoda Kotb), the results are as sweet as they are dramatic. Efron tells TODAY how he was "immediately captivated" when he began watching the team compete. (Run time: 1:01)