Most seated poses primarily target the legs and hips as far as stretching goes, but there are a few that work the arms, chest, and shoulders, as well. As you practice these poses, consider supporting your spine with a block, blanket, or bolster underneath you, which will help lift the hips and bring the spine into alignment:

11 Seated Yoga Poses To Try When You Need A Good Stretch - 1511 Seated Yoga Poses To Try When You Need A Good Stretch - 8711 Seated Yoga Poses To Try When You Need A Good Stretch - 81