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Big brothers who know how to exercise will solve the problem for their younger brothers: Why are my arm muscles getting smaller and smaller after exercise?
Behind the arm is the triceps brachii. As long as there is no lack of nutrition and proper exercise, the triceps brachii will not be small.

Triceps brachii: 4 groups of dumbbell flexion and extension.

Narrow distance push-ups 4 groups

Dumbbell neck and back arm flexion and extension 4 groups

The number of people in each group is about 8 to 12, and the weight of dumbbells is adjusted to 8 to 12. The rest time between each group should not exceed 1 minute. You can't practice every day.