These ab stretches will help stretch and rebalance the abdominal muscles. Your abdominal muscles can become tight and sore for many reasons including working out too hard and bad posture. When they become tight and sore, they promote more bad posture.
For the first stretch, you will lie down on your stomach in the prone position. Prop up on your elbows, and hold it for 30 seconds, doing it three times. If that is not enough of a stretch, you can come up into a pushup position with your arms, but keep your hips on the ground. If this is still not quite enough of a stretch, you can go up to your knees, and then drop your stomach down towards the ground getting a big abdominal stretch.
The next stretch will be with a Swiss or therapy ball. You want to lie on your back with your feet on the ground in a table top or half bridge position. Roll enough over it to let your head drop off. If this is not enough of a stretch, you can reach your arms up and back and let them hang down. Hold this for 30 seconds, and do it three times.
Now you will get into a tall kneeling position. You can also do this one standing up, but you might get a better stretch on your knees. Reach your arm up and over to the opposite side. That will get your outer abs. If you want more of a central stretch, reach over and back. Hold this for 30 seconds, and do it three times on each side. You can alternate back and forth or do them all on one side at a time.
The last stretch will still be in tall kneeling. This one is a little tougher, and a stronger stretch, so you might not want to do it the first time until you loosen up your abs some. Lean back while in tall kneeling, and reach for your heels. Grab onto your heels, and arch your back pushing your chest upward towards the ceiling. Hold this for 30 seconds, and do it three times.