Hmm... the most common error I see with beginners in terms of the Thai kick, is the pivot as some have already stated. Of course the best tool for you is going to your Kru evaluating your kick. But maybe we might be able to offer you some insight into other problems, to help you smoothen your learning process.
As far as my experience goes with others learning this kick, is firstly the hip rotation during the pivot. Either people are pivoting too little, or too much. As i was told by an Ex-Lumpinee champ... when you kick, the inside of the shin should make contact with your target because this is where its all bone, and not muscle. This means your kicking leg's toes being pointed slightly upwards during extension, and impact of the kick. The pivot leg however, that foot on the ground... the foot should be pivoted to the point where its heel is pointing towards the target. This means during your kick, not only do you rotate your hips, you also "open" your hips... and this is where the "swing" in the kick is generated. Alot of people when doing their Thai kicks, either don't have the flexibility to open their hips, or they weren't taugh tthe importance of it. I suggest really stretchin the front part of your hip flexor. Just one of the many problems that can exist in this kick. :asian:
