This posture stretches hamstrings, hips, back, neck, and inner thighs.
Placing a block under the forehead helps to encourage hamstring and hip flexibility while keeping the shoulders back and the chest opened.
Head-to-Knee Pose with a Block: How to Do it Step-by-Step
From a Seated Forward Fold, bend one knee and place the foot on the inner thigh.
Place a block at the inside of the outstretched leg, and slowly lower to rest your forehead on the block.
Stay here for 1-5 minutes, and then repeat on the other side.