5 tibetans and hot yoga

First off – greeting to everyone, newbie here.
I watched – and was very impressed – Gabrielles video on core strength, tummy flattening and noticed the simularity between the second tibetan rite and the exercise shown.
In the T5 exercise, both legs are raised on an inhale at the same time as the head and neck are lifted from a flat position on the floor (no ball involved)
I was always a tad unsure about lifting and rounding the neck but I’ve never hurt myself doing it.
What do members here feel.
TIA