I'm posting the trot in the video some, if you look closely
. As long as
you're a balanced rider and you use good a good pad and girth, you can
post, jump, and do anything else "fun" in them. I know some lighter and
more agile riders who mount up without using a step even!
The best pad IME is a Skito pad. Other good pads for treeless saddles
include Equipedic, Haf, Supracor, and Grandeur. Christ makes a sheepskin
pad for treeless saddle. I believe it has some inserts in it. You want a
pad that has 1/2-1" thick inserts on either side of the horse's spine. You
want at least 2" of space between the inserts. This gives your horse
more spinal clearance and helps distribute your weight. It also lends the
saddle some stability.
For girths, I prefer a cotton or mohair string girth or a reall wool/sheepskin
fleece girth. Both types are more "non-slip" than smooth leather or
For jumping and hilly trails/hacking, you'll want an English or Aussie type
breastcollar that goes over the neck. This is a "just in case" piece of
equipment, should your saddle loosen during your ride. I don't use one for
flat work or "normal" trail rides, but I do if we're going out all day or one of
my girls wants to jump in my Black Forest.