What's the outside leg technique?
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The idea involves keeping most of your weight in your OUTSIDE stirrup during the barrel turn. Clearly the guy in the video is leaning inward toward the barrel every time, hence putting all his weight on the inside stirrup instead.
It's a matter of physics and centripetal motion: An object traveling in a circular motion will travel FASTER with the weight to the outside.
Hence why it makes sense (through science) to put most of your weight in your outside stirrup during a barrel turn, while sitting straight up and down in your saddle (do not lean inward, and do not lean outward).
I first learned this concept at a Lynn McKenzie barrel clinic. When you wanted your horse to rate (lets say we are making a left turn), you would rotate your hips in the saddle counter clockwise so that your left hip is slightly back, and your right hip is slightly forward. You put the majority of your weight in your right stirrup, which leaves your left leg "free" to squeeze and hustle your horse.
Now, of course this body position doesn't work for every horse, but that was the main idea --> Weight in the outside stirrup, and keep yourself sitting up straight.
I just found this photo on the internet, but it shows a good snapshot of a rider who is not leaning in or leaning out, and is staying straight in the saddle, weight in the outside foot.
Now although this is a young rider, in this snapshot she appears to be leaning inward heavily. This can cause a horse to shoulder in (see how much weight this horse is bearing on its front end? Most of the weight should be in the hindquarters; not the front end.) and can cause tipped barrels.
Granted now these are just snapshots. Seeing the run in action is always different.