Elfje was a professional bobsleigh athlete for 10 years. After a career as an athlete with participations in the Olympics, the Silver Wolrdcup and a runner-up title in Europe, she turned to coaching, in which she directly started her own business. Through the NASM training, she acquired a lot of knowledge related to coaching. In addition to her 20 years of experience in top-level sport, she was able to gain confidence and grow in her role as a coach.