30 day shred?

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I've lost just over 2 stone and near on 4inches off my waist since start of feb last year just by eatting less than I was doing, , I'm aiming to loose another stone before I start to "tone" myself.
That last stone isn't happening as it stands so I was thinking of some sort of 30 day job to drop the last stone..

Anyone done similar, hints tips etc?