Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Balance board

I bought this for my grandchildren aged 5-8 who are avid skiiers. I thought this would be fun for them when they are off the slopes. They have had a great time learning to balance on it and mastered it within a few days. It is sturdy enough for the adults to join in on the fun, too. It continues to be used by all as they time each other to see who can stay balanced the longest.