Brass instruments in general put high demand on their puppeteers in order to sound good (damn you, piano players and guitar players). I think of it as being a soccer player; you can do your tricks and move the ball around anytime, but in order to be 100% and have the strength to play a whole game, you need a lot of practice. Every day…
There are a few fundamentals in trombone playing that need constant attention. You need to be aware of yur sound, air flow, embouchure, flexibility, attack, slurring, legato playing…as well as making music, a purpose the trombone is more suited for than most other musical instruments! Therefor, here are a few tips to combine some fundamentals, making your practice session more fun (right…).
By combining slurring with staccato and doodle tonguing, you make sure to give the embouchure a healthy workout. Here are a few samples of how you can modify a flexibility exercise by including staccato playing and doodle tonguing. These specific samples are developed from a part of chapter 7 in the book Flexibility For Trombone; Flexibility With Rhythm. With a little bit of creativity, you could give most trombone flexibility exercises the same treatment.
Make sure that your phrasing is precise, and that all attacks sound good and are equal. Adjust the tempo so you can play the whole exercise without changing the pace.
Have fun, play trombone & get rich