Cis dude here, the only way is to have an understanding friend help. There are ways to do it yourself but it’s such a pain and takes forever.

In the long term, laser hair removal. It takes multiple sessions but it’s cheaper than it used to be.

https://www.menshealth.com/grooming/g42575142/best-back-shavers/

One of my biggest sources of dysphoria 🥲

Need to laser blast those assholes

Be hypermobile, otherwise you’re out of luck