Why is the pressure on the ground more when a man is walking than when he is standing?

The pressure exerted on the ground by a man is greatest

The pressure on earth will be least when the man is

How much pressure will man of weight 80kg f exert on the ground when (i) he is lying and (ii) he is standing on his feet ? Given that the area of the body of the man is 0.6 m^(2) and that of a foot is 80 cm^(2).

How much pressure will a boy of wieght 50 kg f exert on the ground when (i) he is lying on ground and (ii) he is standing on his feet ? It is given that the area of the body of the boy is 0.5 m^2 and that of foot is 60 cm^2 . Use g = 10 m//s^2.

Find the pressure exerted by a man weighing 90 kg on the ground. When he is standing on one of his feet having an area of 90 cm^2 .