- Death of neurons—largely counteracted by
- development of new neurons.
Developing new connections between neurons.
Study—subjects (non-active/elderly people/70s-80s).
Control Group—continued to not exercise.
Experimental Group—Walking Program.
Experimental Group—had improved memory/memory got better from exercising/improved judgment.
Principle: use it or lose it.
We are more likely to rust from lack of use than to wear out from overuse.