The Mental Health Foundation is a UK charity that promotes better mental health for all. There is an A-Z of common mental health problems and free downloadable publications introducing a variety of subjects such as sleep, mindfulness, anxiety in children and guides for new parents.

An introduction to the relationship between mental health and exercise is covered in one publication. Encouraging all of us to experience the proven mental health benefits of regular exercise and the pleasurable release of endorphins, boosting self-esteem, relief from our daily worries and the social and community benefits. Building exercise into our daily activities by not being too ambitious, taking the stairs and walking to work are good ways to start, you do not have to join a fancy gym.

https://www.mentalhealth.org.uk