What are the most effective stretches you’ve found to get blood flowing and feel energized?

For myself, I'm in standing verses sitting. That normally helps. Lungs, touching fingers to the ground, reaching to the sky, a little run on the spot. Spreading my legs apart and reaching to each side is also a good one.

I do Sun Salutations to get started as it involves top to toe stretching and some inversions (eg, forward fold, downward dog) which can really wake you up in the morning