Spin classes are trendy — but are they good for your body? Spin classes are trendy — but are they good for your body? Photo Credit: Evan Schneider/StocksyJenna Birch is a freelance health and lifestyle journalist, covering topics like general health, nutrition, fitness, psychology and beauty. She has contributed to many online outlets, such as Yahoo, SELF, Shape, Women’s Health and Allure. Her work has also appeared in magazines like Marie Claire, Real Simple and O.