Cat Cow - one of my fave go to stretches! Do NOT neglect mobility work especially if you train first thing in the morning before your body has a chance to loosen up. The cat-cow is one of many favorites to warm up back and spine before doing heavy squats and deadlifts. Trying to squat or deadlift without doing any sort of warm up routine for your back beforehand is not smart and a good way to get injured. I never did any mobility movements years ago and it contributed to sciatica.
