People Create Magnetic Fields

Magnetism is created by electrons spinning in alignment within living or inert matter. If the spin of enough electrons in living or inert matter is aligned then that matter is magnetic.

Iron is magnetized easily because it has many spare electrons. But just about all matter can be magnetized.

Natural magnets such as hematite contain iron, and they have been magnetized by the earth's magnetic field.

But not only does the earth have a magnetic field. You generate magnetic fields too!
The magnetic field given off by the heart can be measured by a magnetocardiogram and the magnetic field given off by the brain can be measured by a magnetoencephalograph.