Chakra Enhanced Strength

From Narutopedia

Chakra Enhanced Strength (Unnamed)
Debut
Manga	Chapter #156
Anime	Naruto Episode #89
Data
Classification	Taijutsu, Fighting Style
Class	Offensive
Directly Derived jutsu 100% Single Punch 1000 Meter Punch Butterfly Bullet Bombing Cherry Blossom Impact Painful Sky Leg Sakura Knee Stopper Sakura Rock Breakthrough Woman's Wrath
Users Tsunade Sakura Haruno

This is a jutsu in which the user focuses precise chakra control into their hands or feet to greatly enhance their strength. Tsunade created the concept of this jutsu to intimidate enemies and keep them at bay while she heals injured ninja.

The training for this technique is quite arduous, as Tsunade repeatedly came at Sakura with full power to help her learn. Despite this, the outcome of this training is incredible, giving the user enough strength to easily make large craters or kill opponents with single strikes.