Salamba Sarvangasana (Supported Shoulderstand) is one of the oldest and most therapeutic of the asanas. According to yoga literature, it can relieve allergies, alleviate asthma, stimulate your thyroid, calm your nervous system, and much more.
Try Shoulderstand the next time you're feeling restless, agitated, or stuck in a rut. After a few minutes of pressing down through your upper arms and watching your toes ascend toward the sky, your senses will be heightened and you'll naturally tune in to the here and now. You'll emerge feeling more settled and focused. Who knows? After experiencing this new position, you might even find a fresh solution to an old problem.
If you're a beginner, however, try Viparita Karani (Legs-Up-the-Wall Pose) instead. It will give you many of the same benefits of inverting, but won't strain your neck.