The document discusses how exercise can help alleviate depression through various mechanisms in the brain and body. It notes that putting one foot in front of the other to begin exercising is an important first step, as it can become easier to continue. Various experts are cited discussing how physical activity influences the endocrine system and hormones to positively impact mood, and randomized studies have shown exercise can be as effective as antidepressants for depression. The Eustress kit is introduced as a way to trigger feel-good endorphins and motivate people to exercise through fun and breaking up sedentary routines.