I always thought those stubby arms on the T-Rex were useless, but it turns out I was completely wrong. They seem to work great for doing all kinds of crazy stunts as shown in this video of the dinosaur performing parkour stunts and just plain being awesome.
Okay, this is technically a guy in a T-Rex suit, but hey, if he can do it in a T-Rex suit, I bet a T-Rex could do these fancy moves too. I would love to see that. I hope that when they clone dinosaurs, they give them all kinds of cool new acrobatic skills so we can have some kick-ass new circus type shows when Jurassic World reopens.