6
Long tones. I like to first start by playing our G in the staff as softly as possible and then crescendo all the way up to as loud as I can possibly play and then back down. This should be done over about 15 seconds time. It is VERY IMPORTANT that you do not let your pitch dip when you get louder, this is what the exercise is for. Only play as loudly as you can play with a good tone, but play as softly as possible regardless. Do this with multiple different open notes.