“It's made a noticeable difference.”

English Lesson: It's made a noticeable difference.

You are discussing your exercise routine with a friend who's also interested in exercise. You recently started doing a new type of weight lifting exercise. Your friend asks you if it's been successful. Positively, you respond like this.

It's made a noticeable difference.

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make a noticeable difference

Something "makes a difference" when it causes a situation to change. We usually use this to talk about positive changes:

Having an extra person around to help out has really made a difference.

Painting the living room really made a difference. It used to be so dark and depressing in there.

A "noticeable" difference is a change that's big enough for you to see and notice. It's not as big as a "big difference" but maybe a little bit bigger than a "slight" difference.