6 Yoga Stretches to Wake You Up. 2) Cat Tilt.

Come onto all fours, with your wrists under your shoulders and your knees under your hips. Lengthen your spine, reaching the crown of your head toward the wall in front of you and your tailbone toward the wall behind you. Inhale deeply, then exhale and round your back up toward the ceiling like an angry cat, drawing your chin toward your navel. On the next inhale, arch your back, dropping your belly toward the floor, lifting your sit bones and collarbones, and gazing up toward the ceiling (not shown). Repeat this sequence three times.