Peloton Interactive 's ( PTON -4.13% ) stock price has nearly doubled since it completed its initial public offering at $29 a share just nine months ago. Investors have reacted positively to the company's continued strength in selling its exercise bikes, treadmills, and signing up subscribers to its fitness classes. In its fiscal third quarter (which ended March 31), Peloton grew its connected fitness subscribers by 94% year over year from 457,100 to 886,100. And revenue grew 66% year over year to $524.6 million.