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There is a new peice of data showing on my Garmin 610 when I upload the run. It's called training effect and is rated on a scale of 1-5. With 5 being over reaching, 4 being highly improving, 3 improving, 2 maintaining and 1 negligible.
How is this worked out? Is it any use. Am I really improving as it tells me I am or is it just leading me on?
Any one had any exxperience of this?