Visualization exercises not working?

Dr. Jacob Jordan, author of Total MindBody Training, offers this advice if you're struggling with visualization exercises:

I would recommend first taking more time on the first step to effective visualization: relaxation. Go through the exercises listed in the book for step by step relaxation before attempting any visualization. Adequate relaxation is a must to engage the right brain dynamics necessary for this technique.

Second, I would suggest trying to concentrate more on how the mental image feels rather than stressing the actual mental picture. If imaging a kick, try to sense how your supporting leg would feel, how your hips would turn with the action and the position of your back and shoulders. Some practitioners are simply more kinesthetically (physically) oriented and will ingrain techniques more effectively through sensation than by visual cues.