This routine burns like heeellllll in my abs! ▸ make sure to keep your LOWER BACK flat on the mat. Only lower your legs as far as possible, so your lower back is not lifting off the mat. This is easier when you really engage your ab muscles and "crunch" them inwards the entire time. ▸ you can lay your head on the mat, if that's more comfortable. I can feel my abs working more, if I lift my head though. ▸ THINK ABOUT YOUR ABS the entire time :D it's about the mind muscle connection! Lift and lower your legs with the strength of your abs, not your thighs.