End: Inhale, hold the breath and apply root lock, squeezing the energy up from the buttocks up the spine and out the top of your head through the «crown» or 7th chakra. (sahej.com)
Practice the Kundalini root lock (mulabhand)(which is kind of like a full pelvic kegel) you'll see powerful results. (mindbodygreen.com)
As you squeeze the block you will feel an engagement of your inner thigh muscles (adductors), and the pit of your belly (low transversus abdominis and mula bandha, the subtle root lock). (mindbodygreen.com)