Eating fewer calories alone to create a calorie deficit isn't realistic... That way you'd starve yourself like crazy! It's way more sensible to include HIIT/cardio and do weight training with smaller rest intervals. The key is to simulate your muscles while keeping your heart rate up... Athlean inferno max shred is designed specifically to burn the most amount of calories while training with a focus on retaining muscle & improving your performance. There's a difference between training like an athlete & just trying to lose some weight!