Show off your gains in our Stringer Fitness Muscle Shirt. Designed for comfort and style, this shirt accentuates your physique while providing maximum comfort during workouts. Show off your gains in our Stringer Fitness Muscle Shirt. Designed for comfort and style, this shirt accentuates your physique while providing maximum comfort during workouts. Show off your gains in our Stringer Fitness Muscle Shirt. Designed for comfort and style, this shirt accentuates your physique while providing maximum comfort during workouts.