Exercise has long been known to help with mental health issues such as stress and depression. I have provided a list of NHS and other resources in my book that is due to be published in the summer (2023, see here). This article [here] links to some other resources which look to be helpful in that they seem to cover a wide range of abilities. This other article [here] offers some advice about starting to exercise more if you are intending to do the forms of exercise that are available at a local gym. However, many healthy forms of exercise (such as walking or cycling) can be cheaper and sometimes woven into lifestyle more easily (for example by walking or cycling to work).