Can Peloton be the year's biggest turnaround story?The S&P 500 continues to rise, and more investors are buying into the idea of buying the market. Exchange-traded funds (ETFs) that track the S&P 500, in addition to other indexes, have become incredibly popular over the past few years as the market soars; it's up 71% over the past three years.But growth investors still seek out those rare opportunities that help them beat the market. As long as you do your due diligence and spread your risk, a growth-focuse ...