It will make you fitter. The 13kg won't make you fitter though, just the 'riding a bike' bit.
Well, the difference is actually only 7kg, maybe the combined weight of a full bidon, a sturdy lock and a decent lunch, but how does that work then? Not even uphill?
How hard you push the pedals matters. Everything else just needs to encourage the hard pushing of pedals.
Oh is this supposed to be about commuting?
Nothing to sea hear.
@damosuzuki started
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It will make you fitter. The 13kg won't make you fitter though, just the 'riding a bike' bit.