Long tones
Hold clean blow and draw notes in the middle octave.
C major scale
Play up and down slowly, then repeat with a metronome.
Thirds pattern
Move C-E, D-F, E-G, and back down for interval control.
Slide notes
Add C#, D#, F#, G#, and A# without squeezing the instrument.
Easy song
Use a short melody and keep the rhythm more important than speed.