It is important to do exercise regularly and to do it regularly you need a plan
Here is my exercise plan:
After school I usually do my homework and then I go jogging in a park.
Cycling is not only a great tool for movement but it is a great tool for exercising.
On school days you can drive a bicycle to school, and while going back ride in a park as an exercise.
At the weekends I usually go swimming in a swimming pool.
You can play airsoft with your freinds. If you have your own gear you can just play in your backyard if it's large enough or in a nearby forest.