I think that's why conductors live so long, it's 3 hours of tai chi a day. There was an old conductor I first worked with called Antal Dorati (going back a bit). His wife was sitting in a rehearsal with the bass trombonist's wife. Mrs Dorati said that her husband wakes up stiff and sore every morning, does a 3 hour rehearsal, and comes home full of energy. Harry Spain's wife (wife of the trombonist) said: 'that's odd, my husband wakes up every day full of the joys of spring, comes to work to play for your husband and comes back a ruined husk of a man.' That was my first professional gig. Royal Philharmonic Orchestra, American in Paris. Must be 36 years ago.
That's a great recollection. I bet that could be studied. I know one long-time band director. He's retired, of course, but is very sharp at 96.