Hanging a hammock bench from a ceiling joist? I have myself a sturdy hook, partially an inch in diameter and...

I have myself a sturdy hook, partially an inch in diameter and an inch and a partially of threading. I've found the joist in the ceiling.

Is one joist plenty to support a chair and body shipment? Or should I run a board along the ceiling and draw support from two joists? (Can't access from attic, so it would be screw a board into both joists, afterwards the chair hook into the board. I'd really to some extent not....but if I have to I will :)

Thanks!
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Answers:    The joist will be fine, its the screw eye that you enjoy to be worried about but it sounds approaching you have a devout one. just engender sure you don't over or under drill the pilot. you dont want to split the joist. and as beside all limp furniture, don't get too furious on it.
If i breed a wooden pipe wat is...
joist is not enough. joist serves single for fastening your ceiling boards. they wouldnt definitely serve what you want. look for the beam. if you have concrete beam, there are anchors that serves the purpose