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 the average weight and height for 12-month to 18-month old boys and girls.

Discover the average height for men in America and in the world.

How much should a 9 year old weigh? How tall are 9 year olds on average? Learn the answer to both of these questions in our data-driven article.

Find out the average height for 17 year old males and females in feet.

Find out the average height for 14 year olds in the USA.

How tall are 10 year olds on average? US anthropometric research has the answer.

Learn the average height for a 12 year old boy and a 12 year old girl.

Find out why your 12 inch ankles are too big and learn what you can do about it.

Learn how big 11 inch ankles really are and find out what that means for your body.

Find out how big 10 inch ankles are for men and women.