These are your hips and shoulders.
They are designed to generate power.
Power is force x velocity
That means your hips and shoulders can move a heavy load through a wide range of motion and they can do so rather quickly.
That’s what ball and socket joints are designed to do.
The joints in your spine are your discs.
Your discs are NOT ball-and-socket joints.
They’re fibrocartilaginous joints.
Your discs are collagen fibres stacked on top of each other, layer by layer and held together by a ground substance.
Your discs are an adaptable fabric.
They are NOT designed to generate power.
Exercises like Russian twists generate spine power, because your spine is rotating a weight.
Recall, power = force x velocity.
The implication is that if your spine is rotating the load must be kept as low as possible, that way the power is as low as possible.
Asking your spine to rotate under load is literally like trying to create rotational force with a t-shirt – the fabric will eventually delaminate and tear.
I will say that again, if you continuously generate spine power, your discs will eventually delimitate and tear.
That’s what a disc tear is.
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