. Exercise can release endorphins that change your mood for the better, and staying in shape will ensure that you're able to do the things you want to do. Don't let your lack of health keep you from being free to do what you want to do. Choose something you enjoy doing, as exercise should be fun in itself rather than being viewed as a means to something else.  Release endorphins to free your spirit. Endorphins are your body's own mood lighteners, bio-chemicals produced by your brain in response to pleasant experiences. Endorphins help you to free yourself from unhelpful emotions that can trap you in ongoing cycles of negativity. The ways to help release endorphins do you good, such as exercising, socializing and laughing, all freeing you up to focus on the things that truly matter to you in life. and smile whenever possible. Your smile changes your frame of mind. Make a point of laughing at something every day. Start with laughing at your own antics or fun thoughts, then expand to watching a funny movie or going to a comedy club or just doing something that will encourage you to laugh. Laughing and smiling boosts your immune system as well as making you feel better by releasing endorphins.  Laughing lets your brain know you're happy, and gets you in a great mood, in the right state of mind. The sun can brighten up your day as well as your mood. Go to open spaces, do some trekking, enjoy nature and spend time around people. Obviously, observe sun safe procedures during the hottest months. Being with friends brings out your empathy; understanding and being understood can improve your sense of well-being, also helping to release endorphins. In addition, spending time with friends and being social has been shown to increase serotonin levels, also important for improving your inner well-being.

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Write a summary of the previous text in Vietnamese:
Tập thể dục. Mỉm cười và cười sảng khoải bất kỳ lúc nào. Dành nhiều thời gian ở ngoài trời. Dành thời gian cho bạn bè.