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.

We tried every type of lying dumbbell extension: Here are the 8 best variations.

Learn how to master the decline EZ bar tricep extension.

We tried every version of the decline triceps extension; here are the 7 best variations for muscle growth.

We tried every type of decline cable triceps extension: Here are the 5 best variations for hypertrophy.

Learn how to bulk up your triceps with the decline barbell extension.

Bulk up your triceps with these 7 lying cable extension variations.

Bulk up your arms with your new favorite mass-builder: the barbell lying tricep extension.

Learn how to isolate your triceps with the alternate lying dumbbell extension.

Learn which of the 8 reverse grip skull crushers are most effective for training your triceps.

Learn how to tighten your triceps and strengthen your core with stability ball skull crushers.