How do you check if your control arm bushings are bad?

Hey all,
Something is rattling around when I go over bumps and I suspect its my stock control arms on my 110,000 mile wrangler. Everything else has been replaced except for control arms and springs. I would think that there would be plenty of videos on how the do this for 4x4's but I'm not having any luck. So how do you guys check to make sure that it is indeed the control arm bushings?

Holy cow gentlemen!! Thanks for the advice!! First, let me say that I’m a dork. It was the sway bar end links, both of them. Embarrassing.. I think they loosened up when I disconnected for the first about a month ago. Totally loose. I laid underneath and pushed up on the bumper and they were just rattling away. I retorqued them and it’s a lot quieter.
As far as grabbing them to see if there loose; they don’t move at all. That’s why I thought I must be doing something wrong. But there seems to be a consensus for replacing them due to age. Kind of like airplane parts that time out?
For whatever it’s worth, here’s what the frame to control arm on the right side looks like. I’ve own the vehicle sense 36,000 miles so I assume there original.