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"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.
"when" a human being walks, he "or" she exerts a "number" of force "on" the ground.