BYT

Brace · Bodyweight · Learn first

Bird dog

On hands and knees, wrists under the shoulders, knees under the hips, spine long.

Bird dog
  1. 1Reach the opposite arm and leg out until they are level with the torso.
  2. 2Don't let the hips twist or the low back sag.
  3. 3Bring the elbow and knee back under you, then switch sides.

Easy to miss: Arching the low back to get the leg higher, or rushing the switch.

Muscles

Copper on the figure is a prime mover. The softer tone helps.