Complex sentence: The twister is often confused as being a spine crank since it involves a degree of lateral non-cervical spinal flexion, but the main pressure is however on the cervical spine, hence making it a neck crank.
Split into simpler sentences: The twister is often confused as being a spine crank since it involves a degree of lateral non-cervical spinal flexion. The main pressure is however on the cervical spine, hence making it a neck crank.