Sports! Physical activity is one of the best ways to spend free time because it is fun and healthy. Sports also help develop excellent character traits like persistence, determination, resilience, losing the need to win win win all the time and start enjoying the game (which applies to other activities in life), etc., as well as physical traits like flexibility, good reaction span, strength, agility, etc., not to mention that it helps maintain a healthy body weight; moreover, physical activity always lifts you up into a higher emotional scale and makes you feel great! The feeling of achievement within it is very satisfying. If you are doing them with someone else, it will also be positive socially speaking, an awesome way to make friends and get to know new people.