Activeforever The Original Backnobber II - Manual (Page 15)

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Although there may be some
discomfort while pressing with
The Original Backnobber I I
tool, that discomfort should go
away immediately after use,
and be replaced by more relaxed
muscles, and decreased pain.
Avoid pressing The Original
Backnobber II tool into bones,
especially those on the neck and
directly on the spinal column.
Use either end of The
Original Backnobber II
tool, whichever feels
most comfortable.