What are the eight inner gates?

Answer 1

1. The Gate of Opening located in the brain. Removes the restraints of the brain. Unlocking this gate allows the user to use theFront Lotus.
2. The Gate of Healing , located in the brain. Forcibly increases one's physical strength.
3. The Gate of Life , located on the spinal cord. Allows the user to use the Reverse Lotus.
4. The Gate of Pain located on the spinal cord. Increases the user's speed and power. May cause muscles tissue to tear on use.
5. The Gate of Limit Located in the abdomen.
6. The Gate of View Located in the stomach. Allows the user to perform the Morning Peacock. Opening of this gate releases such large amounts of chakra that it can cause nearby water bodies to form a vortex around the user.
7. The Gate of Wonder Located below the stomach. In the Video Games, allows the user to perform the Eternal Chaotic Dance.
8. The Gate of Death located at the heart. Releasing this gate uses up all of the body's energy. It makes the heart pump at maximum power and exceeds the power of every other gate.

(More info at http://naruto.wikia.com/wiki/Eight_Gates)