Your physical health has a big impact on how you feel.
The endorphins (hormones) produced as a result of exercise can improve your mood, boost your energy levels and increase the quality of your sleep.
Of course, physical fitness is one of the most important elements for a Premier League footballer. They are highly trained individuals. But the exercise they do daily not only prepares them physically for matches, it helps to generate a sense of wellbeing, too.
Leicester City's Marc Albrighton says the hour of exercises he was prescribed each day during the first lockdown helped him to start the day well. "It gave me a purpose," he says in a video where he speaks about the mental side of life in lockdown.
There are simple actions you can do at home or outside to help your emotional health.
Sport England provides a range of fantastic tips, advice and guidance on how to keep or get active in your own home. Why not Join the Movement?
In the "Couch to 5k" programme, you can be coached on how to run 5km by Olympic champion Michael Johnson. Try the NHS training programme.
Nike is the home of elite athletes across the world and you can call upon its expert trainers to help coach you to stay healthy via the Nike Training Club app.
You can access over 190 free workouts across strength, endurance, yoga and mobility.
Premier League clubs have staff who specialise in keeping the players fit, and many of them have produced workout routines that you can follow at home or outside.
Why not give Brighton & Hove Albion's body-weight circuit training video a try?
To help you stay fit and healthy, Newcastle strength and conditioning coach Nick Grantham answered queries on a Twitter Q&A, and you can read his answers here.