Slowing the speed of our movement during reps will provide better results, helping build strength, increase instead of shorten our range of motion and flexibility, improve breathing, reduce risk of injury, and improve brain function.
The law of inertia, simply stated, says that an object at rest stays at rest, and an object in motion stays in motion. This basic law of physics applies to humans and our ability to continue to move our bodies throughout life. Throughout our childhoods, we are constantly in motion, from our first steps to hours of play with our neighborhood friends. Instinctively, our bodies want to move and become strong, flexible, and balanced to negotiate the environment around us. As we grow older and our responsibilities increase, our opportunities to move decline; many of us spend our days tethered to a desk or raveling. As we stay at rest, our bodies begin to deteriorate, and breaking free of the inertia in order to move again becomes increasingly more difficult.