+1 to Doc and Max.
Like many competition shooters, 99.9% of my shooting is at the range standing unsupported. While this certainly has given me confidence in shooting offhand, it also has a downside. It was only when I went to Africa that I was introduced to shooting sticks. I felt like a fish out of water. I had no idea how to use them properly. Nothing seemed natural and I didn't have a good understanding of how to adjust height or how the sticks could change point of impact.

The same could be said about using trees, packs and other rests.

It showed me the need to practice extensively using every position, aid and feature likely to be encountered when actually hunting.