Foam blocks are very common in yoga, meant to increase comfort and stability while in poses. This can be through either supporting a part of your body during a pose, or bringing the ground closer to your reach (like an extension of your arms).
You can use blocks to aid your practice in a variety of poses:
Place a block under your hip to elevate it as you stretch. You can also place a block on either side of your body and use your hands to ease yourself into the splits.
Place blocks under your hands to bring the ground closer.
Place blocks under your feet to elevate them for a jump start.
Place a block (or a towel) under your back to assist in opening your heart.
There are so many ways to use props to train your body to master positions - or to make positions more comfortable for you. Remember to always do what feels best for your body during practice.
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