I joined a gym 2 months ago and have found weight based training has been great for changing my shape. I think I have only lost 3kg but around my hips I have lost 4cm and 3cm around my thighs. Having said that my diet is pretty good but the workout is definitely changing my body shape for the better. When I finish breastfeeding I will be trying kickboxing and step aerobics as I have been told by many trainers the results are amazing for just a few classes each week.