Sakura counters the Iron Sand attack of the Third Kazekage puppet with superhuman strength. She learned from Tsunade that the most important skill of a Medic Ninja is the ability to evade an attack.
i like sassy's line better in the manga- "you call yourself a girl with that monster strength?" LULZ.
and during her 2 and 1/2 years of training sakura grew her hair out but then cut it again.