HoMedics Therapist Select Shiatsu Massaging Cushion —
I bought this for my boyfriend who has had back problems including back spasms. This chair has been a life saver!
It fits very comfortably over the seat of an ergonomic chair we already had and since it's black like the chair - you really don't see it.
The controller fits nicely in a little pocket on the side which keeps it out of the line of sight of our curious toddler and you can have the chair concentrate on the lower back only, upper back only (great for working out a tense neck from working on a computer all day!) or you can go for the whole show and get an upper and lower massage.
Just lean back and press a button and let this chair do its thing. If you have a hard to buy for person, especially someone that frequently has back pain - this chair will be their new best friend.