Just a thought, might he be interested in an allotment? It doesn't need to be a full one, half plots are also available. There's virtually no waiting list in our area, (I'm reduced to going round asking, "Do you know anyone who might like an allotment?")
The thing is, there is a purpose to being there. Many people are complete beginners, luckily weeding, digging and sowing seeds are fairly simple (sowing seeds instructions are on the packet). Surprisingly seeds grow!. He doesn't need to make friends, but they'll slowly find him! People are uncommonly generous, offering seedlings, advice or just chat about the weather. The exercise is good for him, a place where he can be quiet, a purpose and he doesn't have the painful experience of having to talk to strangers without a topic.
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x Maybe you could join a heath centre/spa place. I hate the gym but our local holiday inn has a leisure centre with pool sauna etc. It gives me somewhere to go and a bit of converation.
