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Being physically strong and healthy is beneficial for your mind as well. If you're always tired and under the weather, it's going to be a lot more difficult to deal with issues that arise. Don't neglect your body's health if your goal is to be tough.   Get plenty of sleep. This will keep your body healthy and help you stay mentally alert. Aim for 7-8 hours per night. Make it a priority!  Eat plenty of vegetables and fruits. Making these a mainstay of your diet will provide the vitamins and nutrients your mind needs to stay strong.  Exercise. Cardio and strength training will keep your body and brain in good shape.  Destress. If your world is cluttered up with a million things to do, it'll affect your power to make good decisions. There is strength in numbers. It's easier to build a wall around yourself than to reach out and form deep relationships with other people. Earning and keeping people's trust is no simple feat.  It might sound strange, but exhibiting vulnerability with others is actually an important part of being tough.  Show your family, friends and colleagues, that you're trustworthy and dependable. Answer emails and calls promptly and be there for people when you're needed. Take on a leadership role in your community. You could volunteer your time to help others, coach a little league team, start a neighborhood garden, and so on. Have a stake in your community! Having an active spiritual life will help give you the perspective you need when your problems threaten to consume you. Find ways to become more spiritually aware and connected to the rest of the world. Doing yoga, meditating, participating in a place of worship, and spending time in nature are all good ways to enrich yourself spiritually. Ultimately, being tough comes down to knowing your values and acting on them. Understanding this will help you deflect petty insults and avoid getting wrapped up in drama. It will help you figure out what's important to you and set out to achieve your goals. Most importantly, it will help you boldly make the choice to do what you know is right.
Keep yourself in good physical condition. Form strong bonds with other people. Enrich your spiritual life. Stay true to your values.