Stretching the chest is essential for most of us! These five are great variations. I also would add a sixth restorative variation: Supine over a yoga bolster or a rolled blanket. Place the bolster behind you on the floor, with your hips on the floor and touching the end of the bolster. Lay back along the length of the bolster. Your head should be supported on the bolster, or with an additional pillow or folded blanket. Your legs can be straight on the floor, or bent with the bottoms of your feet together and knees apart on the floor. Rest your arms on the floor at about shoulder high, or slightly lower, palms up. Stay for 2-3 minutes, breathing comfortably.