What are good exercises for upper back which you can preform in the hotel room?
I only have my bodyweight and that's it. Also, I'm not very keen to test the strength of the various hotel's bars/rods by preforming pull-ups / chin-ups on them.
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There's two products I would recommend (I hate to push a product, but these are relatively cheap and effective):
Specific for the back, I would agree with VPeric - using a towel on doorknobs, I would also recommend looking at Ross Enimait's homemade isometric tool/workout: http://rosstraining.com/blog/2009/02/23/homemade-isometric-tool/ Isometrics are VERY effective and with this device there's a wide range of back exercises (specific to your question) that you can do.
As a guy that's on month 4 of living in hotels, I'd add 2 others. The doorknob rows are super useful, too.
Bathroom door pullups. This was weird at first, but I've gotten used to it. Before you attempt these, slide something under the door to stabilize it. I also like to throw a towel over the top of the door.
Under the desk rows. 80% of the rooms I stay in have a desk. Move the desk out where you have some room. Slide yourself under it lengthwise. Grab bith sides of the desk and pull yourself up.