High-intensity-interval-training routines (HIIT workouts) have been shown to be effective for fat loss4. Especially if you have no equipment, really grinding out as much as you can (with good form!) is a great way to get your heart rate up into the upper ranges quickly. As always, the best exercise is the exercise you are going to do. If you tell me I have to do AMRAP snatches and burpees every day (while intermittent fasting), I’m probably just going to eat Cheetos and play video games instead. Enjoying a movement allows you to dig deeper on it, and that hard work is going to be what allows you to burn more fat.