I love my GWF and wouldn't do without it. However a pedometer though would give you a general idea of how active you are outside of the gym. It would be more affordable for now.
FLTS is definately worth the investment. Think of it as your reference book for fat loss. It's something you can come back to again and again and reread pertinent sections for whatever is going on at the time. It's not like some other diet books out there where I would read them once (maybe from the library if I just wanted to know what others are reading) and could summarize the content in two sentences.
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