I am 13 years old and now exercise with dumbbells, each weighing 16 kg. Make five groups, 20 in each group, 200 in both hands, and 30 in the arm circumference.
Upper arm circumference mainly refers to the circumference of biceps brachii and triceps brachii. 30CM is nothing to the average adult, and the girth of a medium height is basically around 28CM. Ronnie cullmann, a bodybuilder like Olympia, has an upper arm circumference of 58.5CM, but like LZ, 13 years old, and an upper arm circumference of 30CM is still very powerful.