A tract in the spinal cord would most likely be found in the white matter is the peripheral region that contains sensory and motor neurons. This region surrounds the central canal which is an extension of a ventricle. So the answer to your question is the peripheral region.
Answer: Bone Mass/Density
Explanation: Resistance exercise can stimulate and activate bone cells to strengthen even build more bone mass. More technical hormones play a role too, but for simplicity strength training can slow bone loss or even rebuild bones.
