The Sidelines Equestrian Triathlon began about 10 years ago and involved three disciplines – hunter/jumper, dressage and polo (pictured).  Once reining was added the Triathlon became a Tetrathlon. It’s not too early to mark your calendars for the 2013 Sidelines Tetrathlon to benefit the Equestrian Aid Foundation, Friday, February 1, 2013. The report from Wyomingis