You wrote:
> Could somebody explain what tailing is please?
Tailing is getting off of the horse to rest him while still making 
forward progress.  You hold a rope/rein and go to the rear where you hold 
onto the tail.  Then the horse may pull you (helps you & is less tiring 
for the horse than carrying you).  This can be especially beneficial 
to the horse & rider up steep mountainsides.  Even on the flat, it 
gives you a chance to stretch your legs after many hours in the 
saddle.
Many of our trails are narrow & don't allow you to walk along side 
of the horse.  In other areas, they are steep, so it is not safe to be in front 
of the horse (especially coming downhill).  Tailing in the rear is a 
good option as long as you can control the horse with your voice & 
with the lead or rein that you are holding.  You DO have to train the 
horse to tail (as in most other things), & I may have second thoughts about
trying it with a confirmed kicker.
Tailing is allowed in endurance riding, but not in competitive trail 
where all forward progress must be made while mounted unless the 
conditions are deemed unsafe by ride management.  I hope that this 
answers your question.  I am sure that you will get a lot of 
responses!
Linda Flemmer 
ABF Challenger ("Rocket") & Eternal Point ("Major")
Blue Wolf Ranch
Chesapeake, VA
   "In case of emergency - Fur side up, steel side down!"