
An exercise, using glissando can also be found in the "Allen Vizzutis books" and in "Brass Tactics" by Chase Sanborn.
The range is from the center note G in the staff, one octave up and one octave down. Try to find the starting pitch without any helping instrument (piano) - then check it. This will train the ear and the "muscle memory" of the starting note G (concert F).
A
B

An important goal in this exercise is to use a lot of air support. Play strong and try to make the sound very clean.