Teaching the Loop
Recently I've taught a lot of new kids how to loop. It always amazes me that some coaches will not teach the loop for the first year, and by that time hitting has been ingrained, and looping will never be as natural. I generally teach kids to loop against backspin as soon as the player can hit 100 forehands and 100 backhands in a row. I usually teach the forehand loop against backspin first, and once that is done properly and consistently (usually a few weeks), the backhand loop against backspin. Both are taught with multiball, with serve and loop against push drills when they are ready.
However, there are two caveats to this. First, I always stress with the player that I will pickier about getting the loop right than with any other technique. It's probably easier to learn a messed-up loop stroke than any other stroke. Once ingrained, poor looping technique is harder to fix than just about any other technique since every aspect of the stroke relies so heavily on every other aspect. If you get one thing wrong, a lot of it will be wrong, and fixing one problem means fixing up all the other problems at the same time, not an easy task.
What often happens is that coaches who teach the loop early to a relative beginner have bad experiences with the player learning bad technique. This is because they weren't picky enough with the student in making sure they get it perfect from day one.
And second, there's the problem that a drive and a loop are rather different strokes, and trying to perfect both at the same time can be tricky. With drives, you are mostly hitting top of the bounce (earlier for most backhands), with the shoulders even, and driving mostly forward with the ball going almost straight into the sponge. With a loop you are taking the ball a little later, dropping the back shoulder, lifting more, and grazing the ball for spin. How do you handle this?