Larmor Precession makes specific predictions about bound ion dynamics, based upon specific combinations of AC and DC magnetic fields. Especially significant is the fact that the external magnetic field environment determines the overall qualities of resonances or particular changes in bio-effects. Given a target with a particular gyromagnetic ratio, Larmor Precession makes predictions that are determined solely by a magnetic field environment itself. An embodiment according to the present invention comprises specific combinations of AC and DC magnetic fields configured to produce specific bio-effects. Preferably an embodiment according to the present invention comprises using Larmor Precession to develop Electromagnetic Field environments targeted towards enhancing or diminishing specific biological processes, including tumor growth, bone and tissue repair, and biological processes and using Larmor Precession to generate magnetic field conditions that take advantage of specific behaviors, including resonances conditions.