How to be psychologically stronger

If more people focused on their mental fitness, however, they'd likely become more successful in achieving the goals they set for themselves—physical fitness or otherwise. After all, your body won't do what your mind doesn't tell it. Building mental muscle is the key to self-discipline, delayed gratification, grit, and perseverance. And those are the skills you need to become the best physical and mental version of yourself.

Here are 10 resolutions that will help you grow mentally stronger:

1. I will spend at least 15 minutes a day in quiet reflection.

A few minutes of quiet time gives you an opportunity to reflect on your progress and think about what you want to do better. Schedule a few minutes every day to recharge your batteries with a little bit of solitude. It will help you gain clarity and renew your motivation to reach your goals.

2. I will do at least one tough thing every week.

Whether you sign up for a photography class or join toastmasters, do something that forces you to step outside your comfort zone. Facing your fears head-on can shift the way you see yourself. Rather than assume you need to avoid hard things because you might fail or because you can't tolerate the stress, you'll chip away at your self-limiting beliefs.

3. I'll write in a gratitude journal.

Write down three things you're grateful for every day and you'll change the way you see the world. Studies link gratitude to a multitude of benefits, from better sleep to reduced psychological distress. It only takes a few minutes each day, but it's an easy way to boost your mental strength.

4. I'll take better care of my physical health.

Your mind won't operate efficiently if you're not fueling it with sleep, exercise, and healthy food. But don't make your goal to be thinner or to look good in a bathing suit. Aim for building a healthy body so you can enjoy a healthier, stronger mind.

5. I'm going to develop a kinder inner dialogue.

The conversations you have with yourself impact the way you behave and how you feel. Harsh self-criticism only holds you back. Commit to talking to yourself the same way you'd speak to a trusted friend and you'll unlock potential you never knew existed.

6. I'm going to become more aware of my feelings.

Aside from happiness or anger, most adults aren't comfortable sharing their feelings. Many are willing to concede, "I've got butterflies in my stomach," or "There was a lump in my throat," because it feels less vulnerable than saying they feel sad or scared. But your emotions play a huge role in every decision you make.

Decide to become better connected to your feelings. Label your emotions and spend time thinking about how they influence the way you think and behave.

7. I'm going to create a timeline for my dream.

A lot of people say, "I'd like to write a book someday," or "Someday I'm going to launch my own business." But since Someday never appears on the calendar, it's unlikely you'll actually do it. Turn your dream into a goal by creating a realistic timeline for yourself. Even if you can't tackle it for another a year or two, start researching or learning more about your dream now.