Hinge down, walk out to a plank, walk back.
Keep your core tight so your hips don't sag when you reach the plank position.
The walkout starts with a hinge that puts a real stretch through your hamstrings, then makes you earn the trip out to a plank and back with your hands. Each rep cycles the hamstrings between that lengthened hinge position and standing tall, with the glutes helping drive you back upright at the end. It is a warm-up cornerstone because it opens the posterior chain and switches on your trunk in one move, no kit required.
As straight as your hamstrings allow with a flat back. A soft bend in the knees is fine, and the stretch down the back of your legs should build over the set as you loosen up.
You stopped bracing once your hands started walking. Keep your midsection tight the whole way out and back, and shorten the walk if you cannot hold a straight line at the far end.
At the start, as part of a dynamic warm-up. They prep the hamstrings for hinging, the shoulders for loading, and the trunk for bracing, which covers most of what a lifting session is about to ask of you.
