What equipment do you need for the Barbell Spinal Jefferson Curl?

It uses a barbell. Without it, the Dumbbell Spinal Jefferson Curl and the Kettlebell Spinal Jefferson Curl train the same muscles the same way.

Is the Barbell Spinal Jefferson Curl good for beginners?

GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Bodyweight Spinal Jefferson Curl.

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A slow loaded spinal flexion with a light barbell — a controlled mobility drill that strengthens the back through full forward bending.

Stand on a low box holding a light barbell at the front of your hips with arms extended.
Tuck your chin to your chest and slowly start rolling the spine downward one segment at a time.
Continue rolling forward through the upper back, then the mid-back, then the lower back.
Allow the bar to drift down toward the feet, keeping the legs straight and the bar close to the body.
Pause briefly at the bottom in a deep forward fold with the spine fully rounded.
Reverse the motion by stacking up segment by segment from the lower back back to the head.

Using too heavy a load, which forces the back to grind instead of moving slowly through each segment.
Bending at the hips like a stiff-leg deadlift instead of rolling through the spine.
Rushing the rep, which removes the controlled tissue loading that makes the drill useful.
Bending the knees to chase depth, which removes the hamstring stretch that pairs with the spinal work.

What muscles does the Barbell Spinal Jefferson Curl work?: Mainly the abs.
What equipment do you need for the Barbell Spinal Jefferson Curl?: It uses a barbell. Without it, the Dumbbell Spinal Jefferson Curl and the Kettlebell Spinal Jefferson Curl train the same muscles the same way.
Is the Barbell Spinal Jefferson Curl good for beginners?: GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Bodyweight Spinal Jefferson Curl.