Found under a video of trombonists on a treadmill:

I do my scales and warmups while pedalling my exercise bike. I try to do it everyday for about a half hour. Being an older amateur I’m trying to get used to a plastic horn. In my younger days I used an elliptical machine while playing jj Johnson’s solo from yesterday’s, the version from live at the opera house with Stan Goetz on my bass trombone. Only way I could approach that JJ sound. I never liked the treadmill because of the impact. However I will try karate kicks and lunges in the pool next time I travel and there’s no exercise bike. I’m a healthier person and more adaptable trombonist for exercise practice. But y’all gotta get them knees pumping just a little bit harder if you’re going to do the theme from Rocky into Strength from Creed while climbing up to the statue of Sylvester Stallone in Philadelphia. Which now you young guys have a request. I want to see it.