How much exercise is enough?
According to the World Health Organization, adults should do a minimum of 150 minutes moderate activity per week OR 75 minutes of more intense exercise.
Try to work hard enough for your hear rate to go up, and your body to get warmer. A couple of times a week you should challenge your muscles as well.
Source 26-09-2018 http://www.who.int/dietphysicalactivity/factsheet_recommendations/en/