Positive reviews for CrossTown Fitness - West Loop highlight the welcoming atmosphere and comfortable environment during workouts. Customers appreciate the trainers' motivation and energy, which push them to perform at their best. The variety of challenging workouts and the effectiveness of combining high-intensity classes with strength training are also praised. The community and knowledgeable coaches are mentioned as major positives, along with the convenience of signing up for classes through the Crosstown app. Overall, customers enjoy the tough and ever-changing workouts provided by CrossTown Fitness - West Loop.