coiling with metal body parts

[Guest guest]

I've got a titanium disc in my low back. I've been instructed to not put the center of the coil over that part as it will heat up. Anyone else have metal body parts that they have to take caution for? Any advice is appreciated. I've coiled my abdomen for weeks without noticing the spine part heating up, but I did feel my belt buckle get hot, which made me think about the disc replacement. Could coiling my abdomen be dangerous even if it's on the front---not my spine?

Steve