![]() So the only thing that affects the forces and energy is the amount and size of the mass you need to rotate and the amount of force you apply. The same holds true for stopping that rotating mass. To rotate or move more mass, you need to apply more force. The meathead in me would explain how the kBox 3 works by saying that it uses different diameter wheels with different mass (as the wheels get bigger, the mass increases). He did such a good job that I’d just be rephrasing his work. If you want an in-depth, well-written look at what an ISO-inertial machine is and how it works, I strongly suggest reading Marco Pozzo’s article, “Monitoring Performance in Strength Training: The SmartCoach System”. Eccentric work shows increases in muscle length, fiber transformation into type IIA, and improved balance and stiffness in tendons.Studies show a higher degree of hypertrophy, muscle activation, and strength in all joint angles by use of ISO-inertial training.You get higher velocity eccentric overload, unlike slow heavy eccentric work or forced reps/negatives with free weights.Every rep is a max load rep if you give maximum effort every time, unlike a barbell where only the final rep is at maximum effort.It catches the strap and pulls back down with equal energy. When you apply force to the strap, it spins the shaft, consequently spinning the flywheel. When the flywheel turns it gathers the strap around the shaft. That strap connects to you and a harness or handle. In essence, the kBox works by placing 1–4 flywheels onto a shaft connected to a strap.The technology recently reappeared to help stave off atrophy and bone loss in conditions of microgravity during space travel.Its origins date back to the Gymnasticon, invented in 1796 by American researcher Francis Lowndes. The kBox is a form of flywheel training (ISO-inertial). ![]() ![]() Here are some highlights, and Fredrik’s article has more depth and citations to other articles and studies. I will begin by urging you to read the article, “What Every Coach Ought to Know About Flywheel Training” by Exxentric co-founder Fredrik Correa, M.D. ![]()
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