You only get a metabolic boost from very intense exercise thought the mechanism known as EPOC.
400 calories burned won't burn anywhere close to 100 and walking isn't going to cause EPOC to happen at all.
EPOC's effects are lowered significantly when you're in a caloric deficit.
Bottom line: this is not something worth worry about.
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Maintaining for two years and I eat whatever I want - just not however much I want. Details here.
Last edited by JohnP; 05-24-2013 at 02:09 PM.