Measuring with a tape measure

Working with my buddy to measure...

• around the head
• around the wrist
• around the waist
• length of hand
• length of arm
• length of foot
• around the chest
• across the chest
• around the ankle
• across the back
• length of leg

Now compare the difference in centimetres between you and your buddy.  What is the difference?  Why are they different/or the same?