I am not very deep into this, but would like to know what you have and how you use it.
And even if not using specific technology, are there any exercises that you do to improve your trombone playing without the instrument or mouthpiece in your hands?
So for a start:
- Practice mutes. I know there are people who use them on purpose to get some extra resistance (?). I only use them to not wake up my kids at night

- A few years back, I got myself a 6 liter breathing bag. From time to time I use this before a practice session just to wake up my breathing and achieve my full lung capacity with a relaxed feel.
- I just got one of these "flow ball" things for Christmas https://www.thomann.de/de/thomann_flow_ball_deluxe.htm It's a funny little exercise that my boys also found pretty fun. It's also a nice way to get your breathing a little sorted.
- I have gone through some devices for supporting mouthpiece/buzzing exercises. Got the classic BERP, the Warburton Buzzard and now the MACK (https://www.thomann.de/de/holger_mack_m ... _shank.htm). I don't do much mouthpiece practice outside a short warmup routine. With the BERP and Buzzard I felt they somehow add a level of control and "slotting" to buzzing that's contrary to what seems to make sense for me. The MACK obviously doesn't change anything in that direction. Let's see if I will use it
- I sometimes use a Warburton PETE, a pencil or whatever gets in my hands as I feel this helps stabilizing the embouchure sometimes
- I also often do some simple stretching and some of the breathing exercises from the Bart van Lier Coordination Training book
Overall I feel that the breathing devices and exercises can especially help when I am NOT physically comfortable for whatever reason.
But overall I do these things not on a daily basis, but more spontaneously.