re: Lower back massager/heating - Xmas gift

i had i think a similar nagging pain type in my low back in my early crossfit days. turns out it was that my glutes/hamstrings/piriformis were tight and "angry" from the xfit intensity. i learned lacrosse ball self-deep tissue massage and it solved that after a few months

now similar back tightness/soreness is usually loosened with floor sitting which stretches the back. i hope you find some relief