James Jackson

James Jackson is a personal trainer who uses his expertise in strength and conditioning to create helpful workout tutorials that show fitness enthusiasts how to build muscle while staying safe in the gym. He draws on the latest sports science data as well as tried and tested training techniques to get the best results for his clients without them having to live in the gym.

Find out why so few people have 10 inch wrists.

Here’s how small 4 inch wrists and 4.5 inch wrists really are.

Discover how small 5 inch wrists really are for males and females.

Is it possible to only have 2 inch wrists or 3 inch wrists?

Find out the average hip circumference and the average hip width for males and females of various ages.

Find out the average buttocks size for men and women and learn how to measure your glutes.

Find out the average shoulder to shoulder measurement for males, females, children, and teenagers.

Here’s how broad 16 inch shoulders really are, according to US anthropometric data.

Learn how wide 17 inch shoulders are for men and women.

Learn how broad your 18 inch shoulders really are.