Thanks for the advice...will try to do that (I am assuming this is for the shower head extension arm.

Not sure what to call the other part that is stuck....the bath tub spout? Looked for a screw underneath (not there) so I am assuming it is just screwed on a threaded pipe. Should I try the same advice for this? Run hot water to warm and loosen? Can I use a strap wrench for this as well?
Thanks~
Mike