The Butt (glutes) are our main powerhouse and driver that partner with the hip flexors (psoas). In the video above you can see how Donna's butt fails the muscle test, the glutes don't know how to function correctly. I then do the activation points for the glutes and re-test, as you can see a huge difference, with me making her hold that leg position and press down with power tells me the butt now knows to switch on and work easily.
The activations are like the muscle to brain communication gets re-plugged into the right socket for that muscle instead of another small muscle's socket. For the computer or tv you have corresponding sockets for cables, usb/ firewire/ ethernet/ power, well each muscle has it's own neural connection wire to the brain that gets plugged into another socket when a stress situation happens (injury, emotional trauma.)
Just my musings.....