Yoga blocks aren't just for the injured or inflexible. Since these lightweight gems offer stability in both beginner poses like Triangle to more advanced moves like Forearm Stand, yogis of all abilities find blocks useful. Blocks help to deepen stretches and allow you to hold poses longer, helping to increase flexibility. If you're confused by all the different shapes and sizes, here's an explanation. So the next time you need a little support, you'll know which block to grab.