My family member is obese and can barely walk outside a block without huffing and puffing. How do I convince him to exercise and change his life?

As said in the title, my family member (brother) has become super reclusive and stays in his room all day. He is in his late 20s and jerks off to porn most of the time as he's told me and doesn't leave the house, and this can go on for days and at times weeks to months. He doesn't have a girlfriend or a job and says he's terrified of people but refuses to get help. Not sure what to do.

My family member is obese and can barely walk outside a block without huffing and puffing. How do I convince him to exercise and change his life?
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