Palms facing down or clenched fist under the thigh across the hip joint will give a momentum for the Hip extension. A good support for the joint and momentum for the muscles. The amount of force should be taken in an order from hamstrings to Pyriformis, Quadratus lumborum, Erector spinae and Multifidus at Lumbar region.
Inhale while raising the thigh and exhale while lowering to the floor. As raising the working muscles called lumbar extensors and hip extensors gain oxygenation and further metabolism that demands the antagonists from the front. The supporting strong short muscles like Pectenius, Erector spinae and Multifidus are going to fix the position of organs like intestines, Urinary bladder, reproductive organs etc, the smooth musculature of pelvic region (2 hip bones and Sacrum and tailbone). Hence it is only that slow movement allows the possibility of awareness. Fast movement bypass the usage of these deep muscles and leads to Lumbar Lordosis. So, avoid lordosis from the beginning stage of learning Salabhasana.
This sequence of events have to be practiced with a lot of attention towards the breath and the muscle work to gain the synchronization. The gradual training from one side to other side creates pressure on the exact pelvic region where the energy field called “Swadhishtana Chakra” in Sanskrit means Sacral wheel in English. This is the connecting region for genital organs, urinary bladder, vagina (female) and anus through para-sympathetic nerves. Para-sympathetic nerves are for relaxation phase of the autonomic nervous system.