Gardening is therapeutic. It is also good exercise. I guess, actually, a lot of things meet those particular criteria.
For instance, in our younger days, my husband and I kept about eight horses. We bedded their stalls with sawdust and cleaned their stalls every day. That resulted in a rather large manure pile by the end of the year. Neither of us minded cleaning those stalls. There is just something about working in a warm horse barn on a cold winter night with the smell of fresh hay and the horses nickering. It’s very relaxing — even though you are working. It’s therapeutic.