I have 2x6 ceiling joists in my finished garage and have attached a ring hanger on a single joist. When I hang my entire body weight there is an almost imperceptible amount of sag on the joist. Because of this I want to strengthen the joist to prevent any movement. Access to the joists from above is not possible and I prefer not to remove the drywall on the ceiling.
I was thinking of adding two 2x4 bridges that run perpendicular across several joists to strengthen the joist which holds the hanger. These will be attached on the ceiling using lag bolts that run through the drywall into the joists.
Does this sounds reasonable or is there a better approach to strengthen the joist?