How Long To Hold The Plank To Lose A Pound Of Body Fat? Well, a person weighing 170 pounds (77kg) will burn about 4 calories holding a plank for one minute. A pound of body fat is about 3500 calories we divide that by 4 and we get 875 minutes or almost 15 hours of planks. The conclusion here is that any direct ab exercises are horrible at burning calories, if you want to lose belly fat do some cardio instead.
