There are many ways to train muscles, and there are many ways to train different parts. Generally, only part of the training is done every day, and the training time should be controlled within 1 hour. The training method with large weight and few times is mainly to make muscles strong, while the training method with small weight and many times will make muscle lines more obvious.
Personally, I feel that practicing muscles is mostly really practicing willpower. No matter what kind of training method is used, it is completely impossible, and the one that relies on willpower will have an effect. If you want to keep fit, you must stick to it, otherwise you won't get results.