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.

Although some might see this as simply super strength, it's actually an application of medical ninjutsu, demanding the ability to concentrate and release chakra in an instant with inhuman timing. Brute strength is meaningless before this technique, due to it being solely based on the release of chakra rather then normal brute strength.

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.

Also, as noted by Kakashi, only those with inhumanly precise chakra control, could ever hope to use such a technique. Making this technique extremely rare and near unteachable to even the most talented of ninja.