@cesare_shapable: If your goal is fat loss, you don't need to choose the exercise that destroys you the most. You need the one you can recover from and repeat consistently. That's why walking is S tier. It's low impact, doesn't interfere much with recovery, and you can accumulate thousands of extra steps every single day. Then combine it with resistance training to help preserve or build muscle while you lose fat. Running, cycling and swimming can all be great tools too. But especially if you're significantly overweight, more impact and more exhaustion aren't automatically better. And remember: exercise supports fat loss. Your calorie deficit drives it. Move more. Lift weights. Eat appropriately. Then repeat it long enough to actually get lean.