Reply To: Trumpet Range
For younger (elementary and junior high) students, it can really just take some time. With my older students, we practice a lot of lip slurs to gain flexibility and scales to inch our way upwards. Long and slow practice is the way to go, but it can be trying on the patience of many students. Playing until their lips stop buzzing can help increase stamina, but it can also enforce bad habits (i.e. pressing the mouthpiece too hard into the lips or playing with bad tone).