[Zanni]

Olympic weightlifting. Seriously. Any physical exercise is going to be a great mood elevator, and weightlifting, due to its high skill requirements and relatively low volume, not as punishing on older athletes. Plus there's a lot of (socially distanced) camaraderie in the gym. As a novice, he could improve very quickly, but it's endlessly deep. And, bonus, the qualifying totals for competition are so low at his age that he could probably be competitive within a year. Saying this as a 57-year old who just got seriously into weightlifting.