Ride his bike to school, find other exercise that lets him stay inside such as pushups, situps, planks etc.
if his parents have a treadmill he can run on that instead
The major difference between a person with good wellness and one towards premature death, is that good wellness people still have a lot to look forwards for and people dying know that they are dying and just forces in what they want do before they die and that all it matters to them
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