It works on frogs. The force is distributed over the whole body, so it’s no worse than gravity is on our bodies.

I disagree. The human body is mostly water. Water is slightly diamagnetic. Therefore, a sufficiently strong magnet is capable of levitating a human body off the ground.

Magnets can definitely have an effect, just not at puny neodymium magnet levels!

Interestingly, some lights are set up to deliberately slow down speeders. If you are above the speed limit, they turn red, just to slow things back down. Unfortunately, most of the people involved never put cause and effect together.