Calorie burn of Manual (blade on handle) Weed trimmer?

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Hi,

I know that there has been a post about the motorized weed whippers/trimmers, etc., but I am trying to estimate how any calories I burn when I use the manual weed whipper.

The whipper that I am using has a 12 inch, serrated, metal blade attached at roughly 4 1/2 foot shovel handle and weighs about 2 - 3 lbs. (Shown here: http://preview.tinyurl.com/l68g2d8.) It's swung some what like a golf club - though I tend to prefer to swing one handed. (I also have a lighter one that actually is mounted on a golf club handle (http://preview.tinyurl.com/kwa85q5). On average, I think that I'm probably swinging it between 25-40 times a minute, and each swing (like a golf swing) engages the lower torso and legs as well.

Any thoughts on how I can estimate the calories I'm burning?

Thanks, Diane

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