hanging weight off of tji beams??

I think that is what they are called...they look like this...


this is in a commercial building.

I own a dance and fitness studio and we are wanting to bring anti gravity yoga into the studio. so we will be hanging "hammocks" from the ceiling

see video... http://www.youtube.com/watch?v=ok9WL06Qyfc

that is essentially what we'll be doing. (hanging, swinging, pulling etc...all in one diretion, the same direction as the beams go)

I have a few ideas on how to hang them..but don't want to compromise my students safety, nor do I want to rip the ceiling down! :no:

1 One idea is to attach my own beams across the bottoms, then hang from those, but I worry that the bottom part of the ibeam is just glued and stapled and won't really support that hanging.

2 Another idea, is to use an L bracket of some sort (obviously a very thick one), set it on to top of the bottom wood (resting on it somewhat), drill into the webbing and put one of those large heavy duty square washers on the other side and bolt it. the hammock would hang on 2 of the brackets, spreading the load between 2 beams, so there wouldn't be a whole person on just one beam.

3 another idea is to use one of these

attach them to the webbing and then I hang off the side...each hammock would have 2 of these facing eachother from opposite beams. But these are expensive! So I would rather go with option 2.

4. OR, can I drill a hole and place a metal pipe of some sort between several beams (through the webbing).

or is any of this even possible? Are there better ways? The beams are pretty long.

I can get pics of the beams later today when I got there if needed.

But I need this figured out quick!

THANKS!