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We conducted a project with professional skiers and their trainers in which we used wearable sensors to improve the trainer-athlete relationship by helping them share their observations and impressions. In particular, we analyzed which sensors reveal important features describing the athlete's motions. Visualization software shows the athletes' movements by overlaying and synchronizing a video stream with sensor data. A system based on wearable sensors and video recording can reveal information about a skier's motions, helping trainers identify the skier's strengths and weaknesses.