The biggest reason people fail is physical tension. You cannot mentally shift if your body is fighting gravity.
In a normal waking state, your left and right brain hemispheres operate at slightly different frequencies. The left hemisphere (logic, language, analysis) might buzz at a Beta frequency, while the right hemisphere (intuition, spatial awareness) operates at a different rate.
It’s the term Bob Monroe used for the resonant state where your left brain (logic) and right brain (intuition) sync into perfect phase. The result? Focus 10: “Mind Awake, Body Asleep.”