My $600 treadmill has a magnet on a string with a clip on the other end, and the magnet has to stay stuck to a surface continually or the motors don't run. I at

My $600 treadmill has a magnet on a string with a clip on the other end, and the magnet has to stay stuck to a surface continually or the motors don't run. I attach the clip to my clothing so if I slip and fall while using the treadmill, it yanks the magnet away and immediately disables the machine. I keep the magnet up high enough that young kids can't get to it. Seems like that can be a reasonable way to greatly reduce the risk of injury.