I sit behind a computer all day and my BF is about 10%. I don't put much (if any) conscious effort into it.
Getting low BF is mostly about diet and not so much about exercise. I workout for 40 mins 2-3 times a week, but I didn't start that until I got down to about 10% anyway.
I also eat as much as I want. It's easiest to raise your BMR and use satiety to control intake by dropping carbs and dairy, eating more meat and fat, eating less often and lifting heavy. (but we will still hear from the "it's all about calories" fools, who will start spouting the usual CW BS about cutting calories)
Some info about carbs and metabolism:
The "Seven Deadly Sins"
• Grains (wheat/rice/oats etc) . . . . . • Dairy (milk/yogurt/butter/cheese etc) . . . . .• Nightshades (peppers/tomato/eggplant etc)
• Tubers (potato/arrowroot etc) . . . • Modernly palatable (cashews/olives etc) . . . • Refined foods (salt/sugars etc )
• Legumes (soy/beans/peas etc)