Chakra Enhanced Strength

This is a jutsu in which the user focuses precise chakra control into their hands or feet and releases it with pinpoint timing, which greatly enhances their strength. Tsunade created the concept of this jutsu to intimidate enemies and keep them at bay while she healed 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 gigantic craters or kill opponents with single strikes.

Trivia
While some may see it as "Superhuman Strength", this technique is actually an application of medical ninjutsu, that demands the ability to concentrate and minute chakra control.