"Neuroplasticity is like how bones work. As you use a bone there are organisms inside the bone (marrow) and they are constantly weakening and strengthening the bones in the places needed. For a runner it could be in the outside of the left femur, while the right femur may become weaker, sincer the runner is running around an oval track in a reverse-clockwork motion. This example is not scientifically ccurate but i hope it helps to serve to show you how bones work. The neurons and glial cells in the brain are similiar."