Arm Positions in Kundalini Yoga

[Megistomedes]

When I position them on my knees or some other where of my legs, I cannot properly do the movement, it's like my arms do the work, like they pull my spine. But when I position them upon chair's arms, I can properly move my spine front and back. But at instructions it says position your arms on knees. Is it really necessary?

 

[Priest - Alexandros Iowno]

Do as it suits you while trying to focus on the spine and develop flexibility, and learning the movements as a fluid movement. Energy rises regardless, you'll figure it out as it happens.