Treadmill Classes Are All the Rage — Here's How to Try It For Yourself

POPSUGARTreadmill Classes Are All the Rage — Here's How to Try It For YourselfPOPSUGARIf you look past the three indoor cycling studios on your block, chances are you'll spot a new type of fitness boutique: group treadmill classes. While running is often a solitary endeavor, these classes help train students in ways that aren't always ...