A human's centre of gravity is the location on the body where the weight of the body is concentrated. A person's height and weight both affect the location of the centre of gravity. Weight is a measurement of the force of gravity on the body, and height affects how the person balances that gravitational pull during movement. Calculating a person's centre of gravity can help him balance better.

- Skill level:
- Moderately Easy

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### Things you need

- Measuring tape
- 2 bathroom scales
- 2 rulers
- Wooden plank

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## Instructions

- 1
Measure the person's height with measuring tape. She should be barefoot so you get a correct measurement.

- 2
Place two flat bathroom scales on the floor. The scales must be calibrated to show the same weights. Lay one ruler vertically in the middle of each scale.

- 3
Lay the plank across the scales so each ruler is 2 inches from the end of the board. Read each scale and add the weights together to get the weight of the board. Write it down.

- 4
Instruct the person to lay down on the board with his head to the right and his feet to the left. Write down the displayed weights on the right scale and the left scale.

- 5
Divide the weight of the board in half. Subtract this halved number from the person's weight reading on the right scale from when he was laying on the board to get a new right side reading. Subtract the halved number from his weight reading on the left scale to get a new left side reading.

- 6
Multiply the length of the board between the rulers by the new left side reading to get number "x." Add the new right side reading to the new left side reading to get number "y."

- 7
Add together "x" and "y." That is the person's centre of gravity calculated in inches. Measure from the person's toes upward, stopping at the number of inches you calculated. That spot is the person's centre of gravity.

#### Tips and warnings

- Select a plank of wood that is 4 inches longer than the person is tall. It must be thick enough to support the weight of the person.