The S&P 500, a broad index of the 500 largest companies by market cap in the U.S., has historically produced an average annual return around 10%. This means that its value doubles about every seven years. But some investors are seeking even better numbers to grow their wealth faster. 

Shares of Crocs (NASDAQ: CROX), Five Below (NASDAQ: FIVE), and Planet Fitness (NYSE: PLNT) have more than doubled over the past five years. Although future returns might not resemble the past, they all have a shot at doing it again, and that's something investors can get excited about. 

Over the past five years, Crocs shares skyrocketed 834%, easily making them the best-performing investment on this list. In fact, just over the last seven months, the stock is up a remarkable 130% -- outstanding gains for a footwear stock. 

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Source Fool.com