Consider those situations that cause your freezing and, if possible, avoid those circumstances. If your freezing occurs in common situations such as narrow passages or going through doorways you will already have a plan in place to counteract the freezing episode. Call for help if necessary. Use a sound or rhythm to stimulate movement. Think of or sing a tune and then move to the beat.
Marches have a good rhythm.
Visualize an object and then lift your foot and try to step over the imaginary object. Imagine floor tiles are stepping stones and try to step from one to another. If you use a cane, draw an imaginary line on the floor and try stepping over the line. If you tend to freeze in a specific place, such as a doorway, try to visualize beyond the obstacle. Once beyond the object, freezing will not likely occur.