Magna Wave PEMF is said to improve muscle energy.

Muscle energy is improved with Magna Wave magnetic fields through myosin phosphorylation, among other processes.

Columbia Encyclopedia:
phosphorylation
phosphorylation, chemical process in which a phosphate group is added to an organic molecule. In living cells phosphorylation is associated with respiration, which takes place in the cell's mitochondria, and photosynthesis, which takes place in the chloroplasts. The energy released during metabolic or photosynthetic processes is captured in the energy-rich phosphate bonds of certain molecules, most commonly in the high-energy bonds of adenosine triphosphate (ATP). In the process of oxidative phosphorylation ATP formation is associated with respiratory uptake of oxygen.