If you want to use resistance bands to work the lower body you need to realize that your thighs are the biggest muscles in your body. You want to make sure that any resistance bands you buy are strong enough so that they don't break during exercise.
Most resistance bands you see in gyms are very low quality and are not strong enough to withstand repeated stress. Bodylastics is the clear leader in this market, and sells a very durable and versatile resistance bands set.
They sell a couple different versions at different price points. Their website has several videos that show the system in action. Visit the Bodylastics website to learn more.
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