Resistance bands work by adding an external resistance force that can be applied without having to hold extra physical weights. The extra resistance works your muscles more and therefore results in a more effective workout.
Just like doing any form exercise, it can take a few weeks to see visible results. Even if you don't see any visible results in the first week or two of use, your body is still getting stronger and you will see results eventually.
The resistance bands help work your muscles more than just with body-weight, meaning you should see results faster because your body is getting worked more.
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