The logic is as follows:
- 6.5 waist girth is a chest girth.
- Waist girth equals 70% of the chest.
- 53% of the chest is equal to hip girth.
- Neck is equal to 37% of chest girth.
- Biceps are equal to 36% of chest girth.
- Lower leg is equal to 34%.
- Forearm girth is equal to 29% of chest girth.
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PLANETCALC, Proportionality of body — McCallum's formula