Take up dancing!
I notice that when I am doing a lot of dancing, people seem to comment more on my height and my posture. It teaches you to be more aware of your body, and it can also be a great social outlet.
My older relatives who dance (one grandmother does tango, the other did flamenco; my great-aunt does square dancing) have all stayed tall and graceful into their 80s and 90s.
Dances: salsa (standard/LA), casino, rueda de casino, cumbia Colombiana, bachata, mambo, cha-cha-chá, merengue, reggaetón.
Currently learning: Mexican cumbia, danzón, Cuban rumba
Dances to Learn in the future: flamenco, tango Argentino, samba, belly dancing, bhangra, ballroom rumba
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