Once one of the market's hottest stocks, Peloton is now a poster child for stock market struggles.When Peloton (PTON +3.41%) had its initial public offering (IPO) in September 2019, it had no idea just how good the timing would prove around six months later. When the COVID-19 pandemic forced a global shutdown, Peloton was in the right place at the right time to capitalize on fitness enthusiasts who could no longer go to a physical gym.From its IPO through December 2020, Peloton's stock price rose by more th ...