Yes, magnetic field lines continue within the body of a magnet. When a magnet is magnetized, its atoms become aligned in such a way that the magnetic field created by each atom adds up to produce a net magnetic field. This magnetic field is continuous both inside and outside the magnet, and the magnetic field lines form closed loops that pass through the magnet's body. The magnetic field is strongest at the poles of the magnet, and the field lines are closer together there, but they continue through the body of the magnet and emerge at the opposite pole