In Martial Arts, rapid, fast and powerful beginning of action is the key for success. A short distance between rivals makes not possible to a wide or long move. High level professionals able to produce a very powerful strike from couple of inches distance. This action demands concentration and consolidation all body muscles in one. When all magnets mounted inside a magnet unit, 200 pounds (90.6 kg) need to separate devices. It is very difficult and some times is not possible for a practitioner, we recommend to start practice with 4-5 magnets inside a magnet unit. Go to How to replace a magnet for more information. Start to practicing with a heavy device weight. After improving an athletic skills and technique, go to an extra heavy one. Don’t enforce preparation, it can lead to injury. Go to Sizes Chart for devices specifications.