Resistance bands have become a popular alternative to traditional iron weights. Body builders and personal trainers use them effectively for a full workout.
Seniors and people rehabilitating from injuries also use resistance bands to improve fitness. Why would one choose to use them over traditional free weights?
Safe
If one drops a resistance band on his or her toe, the toe is not likely to break. They are light, easy to move and safe to use. Dumbbells are heavy, awkward and can be dangerous. If one maxes out on a elastic band, he or she merely needs to release tension on the band. In comparison, maxing out weight on a dumbbell can cause injury. Hands down, training with exercise bands is safer than training with free weights.
Portable
They are light and compact. People who travel frequently can get a full workout by packing their resistance bands into a corner of their suitcase. Exercise bands can be stored in a drawer or under the bed. Free weights can take up an entire room or closet. In addition to their compact size, exercise bands much less expensive than free weights.
http://healthmagazinehouse.com/the-benefits-of-using-resistance-bands/