Cassey Ho is a fitness instructor and creator of POP Pilates. Her blog is a celebration of her love of Pilates and all things fitness. There, you’ll find posts about fashion, fitness, food, and fads that should be left alone. We really like her take on waist trainers, an aesthetics fad that’s taken over social media. Ho’s opinion: They won’t only not give you a smaller waist, but they may hurt you in the process. Instead, she offers effective exercises that can produce similar, lasting, and healthy results.