A New Training Begins: I Will Be Strong!

is episode 86 of the original Naruto anime.

Synopsis
Naruto enjoys a day out on the town while Jiraiya does some investigating into Tsunade's whereabouts. Tsunade on the other hand was gambling at Machijūtoba, a casino were the big bets are made, she was known right away because she is famous in the gambling world as a big loser. When Jiraiya ends up using his time, and Naruto's money, to enjoy sake and women (much to Naruto's fury), he starts teaching Naruto the Rasengan. To begin learning the technique, Naruto must pop a water-filled balloon held in the palm of his hand by spinning the water with his chakra, something he starts with great enthusiasm.

es:Un nuevo entrenamiento comienza: ¡Voy a ser fuerte!