Chest Muscle Expander The chest expander is a piece of exercise equipment that you may remember the mischievous kids from the “Goonies” movie using to tie up Brand. It is a simple piece of equipment consisting of two handles connected by springs that provide resistance. Using the chest expander is sometimes called strand pulling. Remove any one Spring to adjust a comfortable tension in your muscles. Heavy Duty Spring Exerciser ! This Handle Pulling Exerciser is easy to hold or grip and it is a great way to keep health and improve strength. You can exercise in different ways using this Expander: Pull overhead helps broaden upper back, pull behind back helps build arms and holders, holdout stretch to sides helps strengthen upper back and arms etc. It is made up of stainless steel spring wire which is highly durable. It is available at a reasonable price.