Back strenthening

Hello there!

I went to a bodywork practitioner (the Sawas method) and he recommended the following back strengthening exercise:

Lie face down on a table with only your legs on the table
and the rest of your torse is dangling down at a 90 degree angle
(like dandasana rotated 180 degrees)
(have a friend hold down your legs flush with the table for support or use a special gym machine)
While your legs are being held down to the table,
lift your torso up til it’s parallel to the ground and in line with your
legs that are still pressed to the table
Then lower the torse back down to 90 degrees (so your torso is in a headstand-ish position)
Then raise back up to former position.
Do 12-20 reps, 2 times a week

I would like to get your opinion on this exercise.
How does it compare to backward boat pose, locust, cobra, others?
Does it sound safe to you?

I have not yet tried it so I don’t know how it feels. The practitioner seemed to feel that it was the most effective back stregthener.

Thank you so much for your time and helpful discussion board.

This is for a moderate to strong back to get even better. I woudl not recommend it for anyoen in pain. instaed locust and cobra without arm helping are better. I prefer to build tone with a gradually progressive sequence that builds to 12 breaths holding time. all the poses you mention are ideal to build that. if your back is not strained and are fully recovered from injuries then i would say fine to this suggestion. namaste mukunda