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When massaging or stretching, the uneven grid creates a compression loosening effect that helps to loosen tight and twisted fascia and promote blood circulation. Recommended for those who want to improve blood circulation and reduce muscle tightness and fatigue. [How to use] 1. Before use: Prepare gymnastics to warm your body and use in a warm place. Place it on the wall or floor and it fits your body. 2. Compression time: Use under 30 seconds per location and under 10 minutes total 3. How to Compression: Apply pressure to the pressure points and roll back and forth. Start with a light and gradually increase pressure to release the fascia. Use to gently compress the rhythmic with proper posture. You can also roll it back and forth with the sole of your feet on the wheel (tires) part to achieve a stretch effect.