Training Teacher! Strengthening Program is the 12th episode of the Katekyo Hitman Reborn! anime.
Reborn strengthens the abilities of Gokudera and Yamamoto through specially made "training programs," which appear to be more than a simple exercise course. When he discovers that Reborn and Tsuna seem to be paying more attention to Yamamoto, however, Gokudera feels left out. Reborn insists that he figure it out on his own, so Tsuna and Yamamoto must leave him to it and continue with their training. Gokudera comes around after a special conversation.