This is one of my favorite warm-ups. I use it to work on note accuracy, tongue strength, mental concentration, and finger speed. It is also great for ear training chords.

Pattern:
(V7) F, A, C, Eb, C, A
(V7) F, A, C, Eb, C, A
(I) F, Bb, D, F, D, Bb
(I) F, Bb, D, F, D, Bb
(V7) F, A, C, Eb, C, A
(V7) F, A, C, Eb, C, A
(I) Bb, F, D, Bb, F, D,
(I) Bb......
*repeat down a halfstep*

First, you must learn the pattern and get it solid at a slowish tempo. Here I play it at 112 (one triplet per beat) which isn't particularly "slow" per se, but it's comfortable for me and doesn't stress my concentration and tongue too much. I usually run this through once at a slower tempo and then as fast as my tongue can handle and still make it through to the end, which I have uploaded as a second video. At the initial slow tempo, focus on getting as even of a sound on each note as possible. Consistency of attack is another thing to watch for. Stay in the zone and don't quit; plow through the whole exercise even if you screw up. Concentrate!

As always, headphones are recommended!
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Horn: Willson 2900S
Mouthpiece: Bowman 1EU

Audio: GarageBand
Video: QuickTimePro
Mic: Heil PR-20
Interface: Apogee Duet