Bird Dog한 팔 한 다리 뻗기
How to do it
From all fours, reach one arm forward and the opposite leg back, keeping the back flat like a long table.
What it should feel like
You feel long from fingertips to toes in one line, with the belly lightly awake so the torso stays steady.
Common mistakes
Letting the low back sag. Draw the belly in lightly to keep the pelvis level.