This activates = train the erector spinae & trunci muscle – as well as compressing the lumbar spinal nerve openings – which is why patients with radiating pain during exercise must refrain from doing so immediately. In addition, a fracture of the small vertebral joints (species zygapophysialis) can be caused by the peak load in L4 / L5 – especially in osteoporosis.

In some painful herniated discs in patients this exercise had also helped – where Halasana caused the most intense painful.

Some provoked disc herniations forward (ventral) are not noticed.
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