Another exercise that’s good for both abdomen and chest is a certain posture for doing intestine exercises.
In this posture you lie on your back with your shoulders, neck, and chest relaxed. Raise your knees keeping your feet planted firmly on the ground, parallel to each other and hip-width apart. Then raise your hips as high as you can so that you make a straight line from your ribs to your knees.
While in this posture, do intestine exercises by pulling your abdominal muscles below your navel in toward your back and then out again as far as you can. Keep doing this with your breathing relaxed and natural.
Try doing 300 intestine exercises at first and then building up from there, adding another 100 when you master the last. In some training sessions I have done them for half an hour, so you can’t really do too many.
