The Polar F55 Red Velvet provides you with the ultimate fitness experience. Because cardiovascular exercise, strength-training, and relaxation are essential to maximum well being, the Polar F55 gives the modern fitness enthusiast a complete exercise session by adding new features like BodyWorkout and OwnRelax. BodyWorkout, a muscular strength-training guide can be adjusted according to the exerciser's progress, provides basic guidance for strength-training. The new OwnRelax feature, checks the body's state of relaxation, and helps exercisers 'listen' to their bodies, an essential component of fitness. The F55 Red Velvet is the women's version of the F55 and it is sized for a woman's wrist.