I was watching this older video on how to do a ragdoll effect.
At about 9:50 into the video, he tests the effect of the rigidbody constraints by moving one of the objects while playing the animation. I'm using Blender 2.8, so maybe this way easier in the older versions? Is there a setting I need to change? Just pressing spacebar to start and G to move the object does not do what this guy does in the video.