A massager includes a holder having an opening and an insert insertable into and removable from the opening. The holder may be ball-shaped. Opposite ends of the insert may have different spherical curvatures, and the insert may have a cylindrical body. The holder may be softer than the insert. The insert may be inverted to provide an alternative surface for trigger point massaging or other applications. Alternatively, a massager may have a ball assembly in an opening of a holder, with the holder in the form of a truncated sphere. The cup may optionally have an outer surface having a curvature substantially matching the curvature of the holder. Balls or inserts may be provided on a strap loop, with the balls and inserts used in combination or individually.
