Hi Camila - your coach probably has his/her reasons for telling you not to do something. It may be too advanced for you to learn right now, it may be too difficult for your horse, they may just want to practice something else. I'm not your coach so I can't say for sure what their reasoning is, but I would recommend talking to them and asking why they don't want you doing it and when you will be able to do it. If you're really set on learning it you could even request a lesson where you work on that specific thing. Good luck!