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I'm trying to plan routes that are as hilly as possible for training runs over the next couple of months but the gain showing on mapmyrun once I've plotted the route doesn't seem to be right. Either that, or I am fundamentally misunderstanding what "gain" is. I take gain to be, basically, all the elevation gains added together, with elevation loss not counted. So if I run up a hill that takes me from 150ft to 350ft and then down again, I have just done a route with a gain of 200 feet. If I do it twice, it's 400 feet. If I do another hill, up and down, that takes me from 200ft to 300ft, I've done 500 feet overall. Is that correct?
If it is, why might this be happening? I just plotted a 6.5 mile route with 3 climbs on it that mapmyrun shows as having a gain of 574ft. However, when I check the elevation gains for each hill, by hovering the mouse over the lowest, then highest points, noting the differences and then adding them all together, I come up with 732 feet. It also doesn't even notice a 4th climb at all. One hill actually has two peaks, with quite a drop between the two of them, but it just shows it as one constant climb to the main peak. I can understand this is just rubbish mapping but I don't understand why, when it's own map shows 732 feet of gain (as I understand it), it would come up with a figure of 574 feet?
If it is mapmyrun being crap, are there better sites for that sort of thing? Strava, Endomondo?