Resitance bands are reinforced rubber bands, which provide muscle-building tension. These bands offer safe and effective workouts, and are often recommended by physical therapists for rehabilitation purposes.Resistance bands come in a variety of types, lengths and tensions. Some are flat in composition, while others consist of a tubular band that's often surrounded by a protective material. Depending on your specific needs, you can use a band that offers tensions anywhere from 15 lbs. to over 200 lbs. of resistance. Bands tend to be color coded to distinguish between levels of tension. Like free weights or weight machines, resistance bands provide a force against which your muscles must work. This action causes muscles to contract, which stimulates bone as well as muscle growth. 

Advantages

Exercise bands are compact, lightweight and can be used in your home, office or hotel room. They are often used during physical rehabilitation sessions, as they allow the therapist to provide different levels of resistance in a variety of postures and motions that can be modified to suit your specific needs. In contrast, you can perform only a limited amount of movements with free weights or weight machines. Bands provide resistance to just about any motion, and can be especially helpful for athletes.