# Theraband Exercise Band 50 yds

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Elastic resistance is a unique type of resistance training compared to other traditional forms, such as isotonic or isokinetic resistances. The resistance provided by elastic bands or tubing is based on the amount that the band or tubing is stretched. This resistance can be measured in pounds of force depending on the percentage the band or tubing is stretched from its resting length; this is known as “force-elongation”. Regardless of how long the band or tubing is before it’s stretched, the force produced at its stretched length depends on the percent elongation. For example, an initial 2 foot (60 cm) length of Green band that is stretched to 4 feet (120 cm) (double its resting length), is at 100% elongation. Therefore, the resistance of the band is 4.6 pounds at that elongation. If the band is then further stretched to 6 feet (180 cm) (200% elongation), the resistance would be 6.7 pounds.