EUBEST Adjustable Strength Trainer Chest Expander Fitness 5 Resistance Bands (blue) They are light weight, portable and space saving exercise equipment. Perfect for strengthening griping power, waist power and expanding chest, etc 5 tubes are all removable, convenient to choose resistance you want Can be used to workout virtually every muscle in your body: the back, lats, shoulders, hamstrings, quads, forearms and triceps as well as the chest Both for men and women.