Performing this move lying down face up is a great functional position to learn how to access and strengthen you pelvic floor muscles.  Squeezing not holding the towel roll at all times will help you activate your PC muscles and keep a continuous Kegel too.  This is a great better sex move that also helps post-partum women tighten and tone their deep, inner lower core area.  As always begin by first initiating and keeping throughout every move, my Crunchless Abs Set-Up.

1. Place a towel roll slightly above knees and squeeze.  Lying face up press shoulder blades into floor and raise straight arms slightly below chest with palms facing together. 
   
   
2. Dig heels into floor pull toes up and push heels slightly away, which will activate your deep transversus abs. 
   
   
3. Inhale, exhale lifting pelvis off ground keeping equal tension between your lower abs and glutes.  Repeat 2 x 12 reps with a 2-3 count up and down.