Shitenketsumyaku

Tenketsu Control (点穴コントロール, Tenketsu Kontorōru) is a hiden ability normally practiced by the Hyūga Clan, given their mutation that allows them to use it more easily. It has been revealed that most people with the mutation practice this anyway, due to their ability to use it with ease.

Overview
The focal point of this hiden is conscious control over the tenketsu of a shinobi, being able to expel and shape chakra at will, and with mastery with minimal backlash. While a common skill, to find a shinobi who has mastery of over about 4-5, is a rarity. They are usually a Hyūga as well.

Meaning few shinobi ever really possess this ability in full, unless they possess a mutation similar to the Hyūga.