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.

Learn if your 14 inch calves are a normal size.

Learn if it’s normal to have 13 inch calves.

Learn whether or not you should be worried about your 12 inch calves.

Find out if you have a normal calf circumference for your age and gender.

Learn about the heaviest curl ever performed by a human.

Learn how much weight you should be able to curl with barbells and dumbbells.

Learn how performing bicep curls with 10 pound weights can lead to new muscle growth.

Learn how to make 15 pound dumbbell curls challenging enough to build your biceps.

Learn if a 135 lb barbell curl is a good amount of weight to be lifting.

Learn whether or not it’s humanly possible to perform a 150 pound dumbbell curl.