An older gentleman in his 70s that I am quite close to is recovering from cancer. I suggested to him to try Japanese martial arts as a way to recover his body and start a new chapter. His only prior experience is Tai Chi, and he is has always been frail, especially after this ordeal. I don't want to shock him or jeopardize his health by exposing him to a martial art that is too brutal. Besides suggesting that he try Koryu, which I see many older gentlemen doing, I am thinking that a Gendai Budo like Aikido might be a good place for him? What do you think? (Obviously he won't be starting anything too soon due to his own circumstances, and COVID, but I am looking at the future).