I was thinking about this even with strong arms, you still need strong hands, gym work doesnt give you that, to hold onto the ball, the sound and pace of those was clearly fast and hard, but maybe the camera makes it seem harder/faster. BUt it was the thing that stood out for me, when you normally see on tv those saves even from behind the goal cameras(granted no sound) the pace or power doesn't seem the same.
But ya easy do in training, and much easier anticipate when you have clear sight.
Oh and I am better than Alan Kelly at keepy uppy.