You will have to make sacrifices, i.e. time, food, Netflix marathons, money, etc. Unlike trying to fly a space ship to Mars if you are looking to lose fat, add muscle, get in better shape, or eat better your biggest obstacle is going to be you. So you have to hustle harder than your inner negativity. Hustle so hard that you leave the negativity in the past. If you can hustle and make this a real commitment for 6 months and give it the majority of your attention, you can turn your life around completely.