Do 30 day fitness challenges actually work?

I'm trying to get fit, and there is this site that has 30 day fitness challenges. Can a month really make a difference? I'm doing this one:

30dayfitnesschallenges.com/.../...llenge-chart.jpg

I also go jogging in combination. Can it make a visible difference in such a short time?
Do 30 day fitness challenges actually work?
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