The roof system opens and closes by electrical control, which allows you to enjoy exercise in the sun on a good day while also taking into account the pleasure of exercise in the rain or snow.The roof system opens and closes by electrical control, The roof system opens and closes by electrical control, which allows you to enjoy exercise in the sun on a good day while also taking into account the pleasure of exercise in the rain or snow.The roof system opens and closes by electrical control....The roof system opens and closes by electrical control...