Ah, My Hero Lady Tsunade!

is episode 237 of the Naruto: Shippūden anime.

Summary
After Rock Lee falls into a river during their training, Tenten has a flashback of her youth, while waiting for him to surface. When she was a child, she had dreamed of becoming a strong kunoichi like her heroine: Tsunade, and thanks to Guy's guidance she initially began her path towards becoming a legendary medical-nin. However she failed during her training, while trying to heal a fish. So she attempts to sign a contract to summon a creature like Tsunade's famed slugs, but without success because of the quarrel with Ningame, Guy's summon. After many failures, Tenten notices Rock Lee's problems of his own and overhears Guy saying that Lee's ninja way is to proove that one can become a great ninja even with disabilities. Tenten takes Lee's ninja way to heart and the remembers Guy saying that she had a talent for Space–Time Ninjutsu and began honing her unique fighting style while Lee honed his taijutsu skills. After that, Tenten realised that she has become a weapons specialist and gains more faith in herself as a ninja. Tenten then lost to Temari at the chunin exams, and starts to lose confidence. While recovering at the hospital, Tenten came across Tsunade for the first time and then learns about Lee being told by Tsunade that he is not able to be a ninja due to his injuries. While with Neji Hyūga and Guy, Tenten then questions whether Lee's determination (and namley, her own) is all for naught. Guy then reassures Tenten to not take both her and Lee's resolve so lightly, to which Tenten tears up. Lee then takes the surgery to fis his arm and leg, despite the odds of dying. The surgery was a success, and Lee goes to help retrieve Sasuke Uchiha. The flashback ends with Gaara bringing Lee back to the Leaf Village and Lee reuniting with Guy and Tenten. After the flashback, Tenten jumps into the river to get Lee out from under the statue she summoned. While swimming towards Lee, Tenten thinks to herself about how Lee's passion and determination was her inspiration for her to do her best. Lee then opens one of the Eight Gates and pushes the statue off him. Once out of the river, Lee does some pushups for not being able to lift the statue with out the gates. Tenten, being upset that Lee is ignoring her, puts the statue on Lee's back. Tenten leaves Lee alone, despite Lee in being pain with the statue on him, and she vows that instead of becoming just like Tsunade, she would still become a legendary kunoichi with her own skills.