I have no idea what Paleo zone is, and I'm super lazy to open a new tab and Google it, but if they say you should do a 20 block thingy, then do a 20 block thing. I started eating Primal April 12th, (6'4" 225lbs) and I have lost 30lbs since then. (195lbs... still 6'4") I just eliminated refined sugar and grains, I eat as much veggies and fruit as I want, lots of fat, and a modest amount of protein. And I'm on my feet for at least 8 hours a day moving around with work stuff, less than the MaxHR Primal recommends, but moving nonetheless. Good luck, stick with it!
Learn to swim.
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