Jump progress but sore back any good stretch recommendations?

Been working on this jump program for abt 7 weeks aswell as strength and conditioning at training, im 6'3 and weight close to 100 kgs so jumping and ik for some of you not being super light would effect your jump so just wanted to say you all got this, my vert has increased from 26-30 inches in the last 7 weeks which is massive for me as that is almost a ball higher. Ive also just moved to playing opposite which has allowed me to take advantage of my 330 spike height. I am having issues with being achy in my upper back and shoulders, does anyone have any good stretches i could give a try?

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