An intense isometric contraction is terrific for muscle growth for two reasons. First, it quickly recruits the largest motor units because it's a maximum voluntary contraction. Second, isometrics increase the neural drive between the motor cortex in your brain and the trained muscle.
Gymnasts...
Just thought I’d share some gear porn. One of the best things I ever had was a mentor that showed me how to make it. Getting just the raws and cooking is the cheapest and best option! Go ahead and wipe your drool.