You are a right foot forward skier...(it is the opposite for a left foot forward skier)
So when you turn to your right (skier's orientation), that is your strong side. In a slalom course you do better around balls 2,4 & 6.
When you turn to your left that is your weak side. In a slalom course you do worse around balls 1,3 & 5.
This has nothing to do with you per se...it's true for everybody. Generally, it is believed that it is caused your body being in a naturally open position on one's good side.
If you look closely at the video that you posted, you will notice that your turn is more complete on your good side, and you carry a better position through the wakes following your on-side turn. This also gives you better cross course speed.
Last edited by Jorski; 09-12-2011 at 01:31 PM.