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B VIBES - Pro-Series Premium Quality Power Twister for Power Twister 20Kg Spring Forearm Upper Body Exercise for Bicep Arm Strengthening (Black)B VIBES Pro-Series Power Twister Bar Design - a new way for strength training bar and chest exerciser for men. An arm exercise equipment, powerful chest flex bar for muscle builder power, weight lifting, and bodybuilding. The role of throwing arm device, Methods is also known as grip strength. It is used to exercise the arm muscles. Its main exercise muscles and chest auxiliary exercise wrist. Increase the muscle strength of upper limbs. including the pectoralis major shoulder elbow and wrist joints and other parts of the power. It can make the upper limb muscles and increase arm strength. Improve the quality of the body The is a portable exercise device that is great for home, office, or travel use.