Hey no offense but I always cringe when I hear about people practising self arrest. Its really is not something to rely on and most times wont stop you from sliding if the surface is steep and icy. I see folks in the canynon testing their skills on warm, wet 25 degree slopes but never on the slopes that really matter ie cold, dark, icy 45 degrees with a backpack on...oh and by surprise as well. Focus on climbing well not self arresting well.