The Reebok Power Tube Level 3 is perfect for carrying out a wide variety of fitness activities and is great for effectively targeting any muscle group. It is suitable to be used for strength, toning or rehabilitation purposes and works the muscles by focusing tension to the targeted area. Power tubes are a great and popular addition to your home or gym workout routine and can easily be used instead of or in conjunction with free weights.. The tube is 156cm long and has a protective outer sleeve for your safety. It is both small and lightweight making it simple to carry and store and can also be used where space is limited.. Available in 5 resistance levels (sold separately) with level 5 being the heaviest, this level 3 power tube offers mid-range resistance.