Why wearable beats handheld for the lower back
Your lower back is the hardest part of your own body to reach. Anything handheld means twisting your shoulder into an awkward angle and holding it there — which tenses the very area you are trying to relax.
A wearable belt solves that geometrically. It sits exactly where the ache is, holds itself in place with even pressure, and leaves both of your hands free for whatever you were already doing.

