Reddit reviews Voldyne 5000 Volumetric Exerciser (Each)

No problem. It's called an Spirometer.

You can easily buy some online like this one: https://www.amazon.com/dp/B000PAR7KQ/ref=cm_sw_r_cp_apa_i_xTbxDbMHNWBF6

My experience was different since the surgery opened up my chest more because of how extreme my sternum was indented and was pressuring my organs. HI of 9.8

i don't believe in warm ups...just sing the song you want to perform...make sure you execute everything correctly...if you are not going to perform scales in publc, don't sing them...if you do want to sing scales use phrasing so at least it simulates a real song.

I usually only sing never more than an hour. You naturally get tired. You can sing for more than an hour but your body will eventually tire out and even if your mind knows the correct technique your body may be too tired to execute it and you will end up losing your voice.

actually the whole session you just posted is an hour, so I wouldnt wste time on warm ups if you want to sing longer before you get tired.

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I would also exercise the correct breathing. Purchase an incentive spirometer --> https://www.amazon.com/Voldyne-5000-Volumetric-Exerciser-Each/dp/B000PAR7KQ/ref=sr_1_4?keywords=incentive%2Bspirometer&qid=1574556171&sr=8-4&th=1

will help improve breathing