The user forms two large lion-shaped shrouds of chakra around their hands, then attacks the opponent with them. Though its full power was not shown in the manga, in the anime, it was shown that this technique has enough power to destroy Pain's chakra rods, as well as momentarily stunning the target after the attack lands.
In Naruto Shippūden: Ultimate Ninja Storm 2, to execute the Gentle Step Twin Lion Fists, Hinata hits her opponent multiple times with her palms, pushing them back. Then she forms the lion heads and slams them into her opponent, where they explode and send the opponent flying back.
In Naruto Shippuden: Manga Chapter 633, Hinata stated that she intended to perform the, Eight Trigrams Sixty-Four Palms technique for the second time, after mastering it against a Ten-Tails' mini-clone. But this time combined with her Twin Lions Fists.