50% entrepreneur and 50% party-starter, our Fitness Style Expert Brittani Rettig, is best known for leading fierce workouts and treating everyone like family at her boutique fitness studio GRIT Fitness. Bringing an innovative (and FUN!) approach to fitness by providing a customized set of energetic, music-driven classes, this Harvard Business School grad spends her free time blogging about fitness and health on her nationally-recognized GRIT by Brit blog. After leaving her nine-to-five day job in consulting behind her, this high-energy entrepreneur opened her first studio in East Dallas in January 2015 and just broke ground on her new studio (opening this summer) in Dallas’ Design District. A former Céline and Chanel addict, Brit has her thumb on what’s hot now, from Nike tights to Fabletics separates.