Jack Nirenstein visualized that gravity is the only force that can trigger a walk, jog, run and sprint. Gravity starts these variations in speed activities when the body’s center of mass is shifted ahead of the vertical line of gravity over the foot. The general public is aware that gravity will rotate the body around the foot all the way down to the ground like it will do to a falling tree. The scientists have not figured out that when a person or animal jumps from the start of the rotation it raises the rotation of the body to land on the other leg at the right height for movement parallel to the ground. It drops the foot/feet at another spot ahead of the previous spot.
Right after your help in his junior year my stepson Donald swept four events in a single day in the District Track Meet. It was the best performance of his athletic career.—Robert Tindall, Track and Field Coach. 1752 Bolton Abbey Dr., Jacksonville, FL 32223
Boy, are you going to rock the sporting industry. Your running technique will take hold and will be the wave of the future. It is almost like holding on to a patent on a great invention.—Jody Hawkins, four time US National Champion.
Congratulations on your great work. —Dr. George Sheehan, Cardiologist, runner, and author of many books and articles on running.
Insightful for both beginning and experienced runners —The President’s Council on Physical Fitness and Sports
“Jack Nirenstein is an artist with a modern day scientific mind in the way Leonardo Da Vinci was in his time. He is a dedicated member with a passion for running” —Jonathan Gibson, Director of a Hospital-Based Wellness & Fitness Center
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Book Description America Star Books, 2010. Paperback. Book Condition: Brand New. 156 pages. In Stock. Bookseller Inventory # zk1456003305
Book Description America Star Books, 2010. Paperback. Book Condition: New. book. Bookseller Inventory # M1456003305