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Bathing salt fitness
Still have to rely on sit-ups. Don't say it's useless. From 20 to 200, do you think it is useful? You can also add barbell practice. In addition, push-ups are not only effective for chest muscles, but also for abdominal muscles. Remember that actions must be standardized.

Send you three pictures, the first one is to inspire you, and the second one is the essentials and norms of action.