Keep in mind that the difficulty modes were added by Nicalis, not Pixel. The original game's approach to making new difficulties was the creation of Hell. However 3hp runs were a common self-imposed challenge by fans before CS+ was even a thing, so there is history there.
Magnets reportedly can damage CRT screens and tape/film based storage. Make sure you upgrade from floppy drives and tape drives to other storage mediums and trade your CRT in for LCD. I know it is a tall ask, but do this and your computer will be magnet safe. ;P