Plus the activate all the muscles that cross the knee thus developing more support for the knee in postures where the knee is exposed, On one leg postures, Lotus, Vajrasana etc.
the focus on raising the hip is helpful for working on advanced backbends like Kapotasana where we want to get the hips as far forward as possible.
There is a little 'nudge' to the lower back, as Ramaswami puts it, at the end of the raising of the leg which stretches the small of the back and lifts the leg a little higher.
I find it helps to think o fit e raising of the leg as coming from the hip rather than thinking of raising the other end, the foot, the leg
Rather than thinking about straightening the leg think more of stretching through the leg which helps to straighten it.
|Leg raise, Inversion sequence|
|Leg raise, Supine sequence|
|leg raise, supine sequence|
|leg raise from urdhva danurasana|
NB: These are practice notes that will be tidied up and put into the new edition of my Vinyasa Yoga Practice Book along with the current sequences and subroutines. The book can be freely downloaded HERE. There is a page on Facebook HERE with all the latest sheets and updates. This book is in no way a substitute for Ramaswami's Complete Book of Vinyasa Yoga.