I think I've spent at least 50% of my life over the last month sitting prisoner in a car or stuffed into a seat on an airplane. And the rest of the time my muscles have been under constant stress from my American Ninja Warrior training regimen. Or maybe from sitting hunched over my keyboard. The point is, I am a (strapping, 6'2") ball(er) of knots, and Zyllion makes a pretty sweet, pretty cheap full-range neck and back massager.
The key to Zyllion's kneading dominance is their shiatsu massage balls. This seat cushion has two pairs of 4 nodes, one that rotates at the neck region, and one that both rotates and rolls the length of your spine at the back area. It also has a seat cushion with 3 levels of "vibration massage." If you know what I mean.
Each massaging segment can turn on and off separately, as can their built-in heat functions. Deep-kneading, rolling, and vibration settings, and shiatsu node position, height, and width adjustments are all controlled via remote. The cushion attaches to any chair with an adjustable back strap.