Rafter mounted pull up bar

I have a spare room with a tall rafter cutting across the ceiling. It looks like the perfect place to mount a pull up bar and hang my rings. I'd like to find a bar to mount on the back side of the rafter, so it won't show (my fiancee's request of course ).

Can anyone recommend a good product?

EMT electrical conduit and some metal straps. Put some sturdy blocks into the backside of the rafter, and then attach the conduit to the blocks with the straps.

I would look at these:

http://www.amazon.com/Above-Door-Chin-u ... 265&sr=8-5

http://www.amazon.com/Joist-Mount-Chin- ... 265&sr=8-6

Thanks for the tips guys! I ordered the above the door bar from New York Barbell. I'll post a pic when I get it.