Rolly-Polly-ing
The alternate, serious title might be self-myofascial release, self-massage, self-trigger point therapy etc etc.
I’ve been loving my Yamuna ball for the past few months as a tool to help with my back as well as general soreness & stuckness. It’s hugely useful. Back about a year ago, I did take a workshop on the technique, and I’ve also studied how to use foam rollers for self-…. well, all the stuff above.
But here’s what I say when asked about it: Don’t worry too much about specific technique. (This is one of the few times I say those words.) Get in there, find a knot, or a hot spot, or a line of tension and then, this is key, STAY ON IT FOR A WHILE. Like, two to seven or ten minutes or however long it takes for the knot to unwind a little, or the sensation of tension or heat or prickly to diminish.
Biggest problem I see with folks on foam rollers or balls or other tools is that they roll really fast over everything, quick like bunnies, and never take the time to get in there & wait for release/change.
It take patience but does make this work PERFECT for doing while watching TV, talking on speakerphone, or even surfing the web if you are very coordinated. 
Had a fab sweaty practice this morning & am running around the rest of the day. Going to Pensacola, FL tomorrow until next Tuesday. I am, in keeping with recent tradition, not bringing the computer. (YAY!) I may have access to one down there, or just have to catch up upon my return.
Hope you are enjoying amazing spring weather today & the rest of the week!!