Warning! The Original Tuning Board™System is not a toy, and is by design an unstable surface. Until able to manage the system safely, always use a handrail or other support. For best foot, ankle, and lower leg responsiveness and to prevent slipping, use bare feet or “bare foot” style shoes with a non-slip surface. Make sure the Tuning Board’s surface and user’s feet are dry before using. Failure to exercise caution could result in injury. Read all warnings and safety instructions before using. Use at your own risk. Designer/Manufacturer is not liable for injuries resulting from use or misuse of this product.