下面文章中有4处, 需要添加小标题。请从以下选项（A、B、C、D、E）中选出符合各段意思的小标题。
A. Exercise
B. Early to Bed, Early to Rise
C. Read Challenging Books
D. Take Time to Think Deeply
E. Reducing Television Watching
Your brain needs exercise just like a muscle. If you use it often and in the right ways, you will become a more skilled thinker and increase your ability to focus. Here are 5 simple ways anyone can have a try.
__________—— This is a hard sell（强迫推销）. People love vegetating（="doing" nothing like plants） in front of the television, myself included more often than I’d like. The problem is watching television doesn’t use your mental capacity or allow it to recharge. It’s like having the energy taken out of a muscle without the health benefits of exercise. When you feel like relaxing, try reading a book instead. If you’re too tired, listen to some music. When you’re with your friends or family, leave the tube off and have some communication. All of these things use your mind more than television and allow you to relax.
__________—— Many people like to read popular suspense fiction, but generally these books aren't mentally beneficial. If you want to improve your thinking and writing ability you should read books that make you focus. Reading a classic novel can change your view of the world and will make you think in more precise, elegant English. Don’t be afraid to look up a word if you don’t know it, and don’t be afraid of dense passages. Take your time, re-read when necessary and you’ll soon grow used to the author’s style.
__________—— Nothing makes it harder to concentrate than the lack of sleep. You'll be most energetic if you go to bed early and don’t sleep more than 8 hours. If you stay up late, you’ll wake up tiredly and have trouble focusing. In my experience the early morning hours are the most productive. Waking up early gives you more productive hours and maximizes your mental acuity（敏锐）all day.
__________—— Often our lives get so busy that we become defeated without even realizing it. It becomes difficult to concentrate because disturbing thoughts keep interrupting. Spending some time alone having second thoughts gives you a chance to organize your thoughts and have a better understanding of what's important and what isn’t. The unimportant stuff won’t bother you anymore and your mind will feel less tired.