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1. The title sucks. This article is basically about adding lunges on top of walks. Conclusion: "Yes, adding lunges is good". Again, the title and the setup for this article completely misrepresent what it's saying.

2. My opinion, nothing to do with the article, though a lot to do with the misleading title: Overall, walking for 30 mins to an hour a day is huge and will increase fitness an incredible amount over nothing. Of course, it can replace neither intensive cardio, weight lifting, or mobility work. But throw a few hills in there, and it's probably sufficient to stay healthy.