There seems to be a myth over strength training in the gym.
Exercise increases the capacity of our muscle to oxidise fat. (Melanson et al, 2009) muscle weighs more than fat. Therefore, if we exercise and burn off our excess fat, we gain muscle, and therefore perhaps are not any lighter, but lose inches.
Also we have to consider our base metabolic rate (BMR). This is the rate at which out body burns fat at rest. The fitter we are, the more muscle we have, the more efficient our bodies are at burning fat.
Therefore, when I say I am going back to the gym, I mean I am toning up my engine, and aim to increase fitness and lose inches by increasing muscle mass.
I hope that now makes sense. You will NOT become huge by going to the gym, providing you do the correct programme, set by an exercise professional.