Here are some abdominal stretching exercises:
Cat-Cow Stretch: 
Start on your hands and knees with your wrists directly under your shoulders and your knees directly under your hips. Inhale as you arch your back, dropping your belly towards the floor and lifting your head and tailbone towards the ceiling. Exhale as you round your spine, tucking your chin to your chest and bringing your tailbone towards your knees. Repeat for several breaths.
Seated Forward Bend:
Sit on the floor with your legs extended in front of you. Inhale as you reach your arms up towards the ceiling, then exhale as you fold forward from the hips, reaching towards your toes. Hold for several breaths and then slowly roll back up to a seated position.
Standing Side Stretch:
Stand with your feet hip-width apart and your arms at your sides. Inhale as you reach your left arm up towards the ceiling, then exhale as you lean to the right, stretching the left side of your body. Hold for several breaths and then switch sides.
Cobra Stretch:
Lie on your stomach with your hands on the ground under your shoulders. Inhale as you lift your chest off the ground, keeping your shoulders down and your elbows close to your body. Exhale as you release back down to the ground. Repeat for several breaths.
Child’s Pose:
Start on your hands and knees with your wrists under your shoulders and your knees under your hips. Sit back on your heels and stretch your arms forward, lowering your forehead to the ground. Hold for several breaths.
Remember to breathe deeply and to stretch slowly and gently. Only stretch to the point of mild discomfort, never pain. If you have any existing medical conditions or injuries, be sure to consult with your doctor or physical therapist before attempting any new exercises.
