Before selling resistance bands, we did some market research. There are currently no uniform rules on resistance level. Some shops may don’t test the resistance values, just guess and fill in an approximate resistance number. Or they just simply test the resistance values manually. Therefore, we test all of our resistance bands by professional equipment to get the accurate resistance number, and then set a reasonable resistance range according to the result.
What we test most often of our band is the resistance at 1 times(approx 6.8 feet) or 1.5 times(approx 8.5 feet) elongation.Other elongation values can be calculated scientifically from this result.
Elongation up to 4 times is generally difficult to stretch any further cause of the elastic elastic protection inertia.
The resistance value usually changes differently depending on how you use it. For example, if you anchor one end of the 20lb band and stretch it in one direction with both hands, you will be getting 20lbs of resistance. But, if you anchor the band in the middle and stretch it in different directions with your hand, each side will give you 10lbs of resistance.
If you want to learn more about resistance level, you can click the link below to get more information:
https://www.hq-rubber.com/resistance-band