In finding that the taxpayer could not deduct the costs incurred by her in seeking to develop her daughter (who was in the taxation years in issue between 13 and 15 years of age) as an Olympic-calibre equestrian show jumper, Décary J.A. stated (at p. 5461 that "the start-up period, in a case such as this one, can only begin, not when the rider is reasonably expected to become an accomplished rider, but when she has become one", and that "until then, the cost of training the rider can only be described as training expenses prior to the day the business is commenced".