HOW: Get set up in a seated position barefoot with your foot resting on the ground. To perform the exercise, raise your big toe while keeping the other toes flat on the floor. Don’t allow the foot to roll out as you perform this, this may give you a false sense of big toe elevation.
FEEL: You should feel your foot muscles working to perform this exercise and control the motion. It may be challenging and even frustrating at first, but try to relax your foot and 'try less' versus tensing up. The more you practice this the better you will get at isolating the big toe and the greater the range of motion you will be able to go through.
COMPENSATION: Avoid the urge to excessively flex and curl the little toes while they rest on the ground, just use a little pressure. Try to keep the rest of your leg above your foot/ankle 'quiet' and relaxed.