The A-stretch puts a lot of strain on the wrist and is limited by wrist strength. You could heat it from the top. So, the a-stretch probably has a lower technical difficulty but limits the effective stretching power.
The stretch in this routine puts all the effort into the shoulder and the wrist is kept straight. You can also heat this from the top, there’s no need for a heated pot. I think the biggest disadvantage of this stretch may be how it impacts on the back if done badly and potentially even when done well. It requires a twist in the spine and it’s essential to locate the twist lower down in the spine and to alternate hands to ensure balance to the twisting effect. Though spinal twisting can be done well, it can also be done very badly, with multiple ramifications. I would recommend reading on the technical side of asanas with twists.
In the end you have to modify any routine to fit with what works best for you.
Whether, as a hanger, this routine would do it for you, I’m not sure. To me this form of stretching is an attempt to manually imitate the hanging experience, with one of the best gripping tools available (the hand) in place of a hanger and though it uses a long hold in manual terms it would be considered very short in hanging terms.
Does that help?
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