The hormones released during exercise that is linked to happiness is adrenaline cortisol testosterone serotonin

Serotonin

The hormone released during exercise that is linked to happiness is serotonin.

Explanation:

Serotonin refers to a chemical produced in the brain which performs wide variety of functions in the human body. It is referred to the happy chemical because it contributes to happiness and wellbeing.  It transmits messages between nerve cells and contributes to wellbeing and happiness. It is also a natural mood stabilizer. It has impact on every part of the body, from emotions to motor skills.

the answer is : )

because health skills are tools and strategies and also practical skills are also something you need to learn (like tools and strategies) and put it in reality.