Well in that case, three weeks isn't a lot, lol, just stick at it.

Once you really get into the swing of things you'll notice the progress. Then after a while it'll seem to stop again when you hit "the wall". Keep the work up and things will motor again.

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Just make sure you're not weighing yourself or studying your physique every couple of days, that's the worst thing you can do. Do it every four weeks or something like that