Plank that slides, core that shakes.
Move like one rigid board, don't let your hips dip as you saw back and forth.
The body saw takes a forearm plank and slides it forward and back, and that small shift changes everything, as your shoulders travel past your elbows the lever gets longer and your abs must fight harder to stop your lower back arching. It is anti-extension training with a dial you control, saw further for more, shorter for less. A brutal upgrade once standard planks stop registering.
Sawing forward moves your body ahead of its base of support, lengthening the lever your abs have to control. A few centimetres of travel can double how hard the plank feels.
As far as you can with zero sag or arch in your lower back. Range is earned, start small and extend the saw as your core gets stronger.
No, the movement comes from rocking on your forearms and toes. Sliders or a towel under the feet just give a bigger, smoother range on suitable floors.
