Sensei took a long time getting us warmed up; and there was a moment when we were breathing and stretching and I felt my revved-up mind let go and connect with my body.
Yes, its a "letting go". It happens if we "let" it.
We can "make" the mind concentrate, but we must "let" it be mindful.
If we "make" Aikido work, we use force and muscle and its not Aikido (its wrestling). We must "let" ourselves connect and move, "letting" the technique work.
Compliments and appreciation.