Chiyo using a Tensei Ninjutsu on Gaara: the One's Own Life Reincarnation.
Tensei Ninjutsu (転生忍術, literally meaning: Life Transfer Ninja Techniques" or "Reincarnation Ninja Techniques) are techniques that require or accomplish the transfer of life force between people. Under normal circumstances, due to the death of a person being involved, such techniques are generally classified as kinjutsu. The restoration of one life typically requires the sacrifice of another.