New and changed habits with mostly sedentary jobs and activities ask for selectiv and specific power-training because of healthiness. Power-training is the base for a body that works good and lipometabolism. Only muscles can burn fat!
Furthermore power-training enhances the optic of your body, thats another major reason for the fitness-boom during the last years. More and more people want to save time for going to the gym and create their own gym at home.