Pushing on a certain spot on my arm. I don’t actually know why it works I’ve never really asked anyone- but it’s where I circled in the photo. Helps me focus once I start looking for it and then once I actually find the spot and start pushing it helps even more. Your spot may differ- feel around for it. You’ll know what I’m talking about.

Visualizing firearm internals and mentally disassembling/reassembling them