Back tucks are hard, and getting enough height/rotation is quite difficult. This first video is a common example of the lack of height and rotation I typically see. I know this girl, is very young, and it’s impressive that she is already putting this skill on the beam. But it’s a good example of some common problems with back tucks.
This next video is an exaggerated example of what I think gymnasts need to be able to do before they put their back tuck on the beam. While most kids will never be able to back tuck up to this height, I think all gymnasts should be able to back tuck up to at least a small panel mat before attempting it on the beam. It’s something that I think needs to be insisted upon by the coach in order to keep gymnasts safe.
This final video is of what a back tuck theoretically should look like on the beam. Her chest lands upright, instead of landing with her chest down and bringing it up at the end.