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

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

Is the Kettlebell 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 segmental spinal flexion with a light kettlebell that builds end-range loaded mobility through the back.

Stand on a sturdy box or bench holding a light kettlebell with both hands in front of your thighs.
Tuck your chin to your chest and begin rolling your spine down one vertebra at a time.
Let the kettlebell travel down toward the floor as the spine flexes through its full range.
Reach the deepest comfortable stretch with knees mostly straight, not locked out.
Reverse the motion by stacking the spine back up from the lower back to the head.
Finish standing tall with the kettlebell in front of the thighs and reset before the next rep.

Loading too heavy too soon, which turns a mobility drill into a back strain risk.
Bending the knees deeply to reach the floor instead of moving through the spine.
Rushing the descent instead of moving one segment at a time with control.
Skipping the slow stack-up on the way back, which is where most of the strength gain lives.

What muscles does the Kettlebell Spinal Jefferson Curl work?: Mainly the abs.
What equipment do you need for the Kettlebell Spinal Jefferson Curl?: It uses a kettlebell. Without it, the Barbell Spinal Jefferson Curl and the Dumbbell Spinal Jefferson Curl train the same muscles the same way.
Is the Kettlebell 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.