sends a signal to the brain which in turn sends Negative energy to heal the site. Bio Negative Magnetic energy is simply an amplified form of the body's natural electrical healing energy.
Awooga Awooga, pseudoscience bull**** alert, maximum strength.
There are a number of alternative "therapies" that use magnets for healing. There is no evidence that any of them work (i.e. they don't).
There have been some studies that suggest that long term exposure to powerful electromagnetic fields might cause some DNA damage. But so does exposure to sunlight. And natural background radiation. And getting old.
The earth has a magetic field, MRI scanners have immensely powerful magetic fields, all electrical appliances emit magnetic fields.
So I think it's fairly safe to say that a couple of rare earth magnets strapped to a bike wouldn't cause anyone any harm*.
Unless you're a robot. Or a pigeon.
* No idea if it'd trigger the traffic lights either mind....