KnuckleUp Fitness, located in Sandy Springs, Georgia, has received a mix of reviews from its members. Many reviewers praise the welcoming atmosphere, knowledgeable instructors, and diverse class offerings, particularly in Brazilian Jiu-Jitsu and kickboxing, highlighting the supportive community and personal growth opportunities. However, some negative feedback points to issues with management and contract policies. Overall, potential members are encouraged to visit or contact the school for more information.