I didn't know about this limitation. I shake my hands almost every day, maybe every other day. My hands never hurt almost, very rarely. And I shake other parts of the body when it doesn't hurt just and it's not lazy :)
If you are not taking supplemental stimulants, then you should not exercise very often at all, let alone work out one muscle group more than once a week. But there are many ways to get off the ground without chemistry. For example, insert approaches, read about them. The static-dynamic training method, which I saw in the video by Stanislav Lindover, helped me a lot. Of course, it is necessary to optimize nutrition, you can try various supplements, but you need to be careful with creatine, it is not such a safe thing, in any case, if there are or had problems with the kidneys, I would not use creatine in any case, you can do without him, believe me.
If you ask a similar question here, then I think you have not achieved much success in bodybuilding. Here is my personal experience, I did it for 2 years, at first everything went on, but then I noticed that it wasn’t even going, but continued to study, while the food was bad, I drank often, and didn’t change the program, as a result of a plateau. At one point I realized that it was time. In short, at the first stages of your "serious swing" (provided that you have little experience), everything is generally simple: It is enough to swing hard for a month + do not drink alcohol + drink creatine + balanced nutrition + protein (2 servings per day) + fish oil. about 5 kg. (I personally typed 4) Then it is more difficult, the body needs more, therefore, it will also need to eat more (you will increase the calorie content, the main thing is to monitor the quality composition, sport pits are at the same level, except for creatine and fish oil, they must be drunk at regular intervals), but You will see the result, believe me (the motivation is not weak), I gained 10 kg in six months, I don’t argue there is not pure meat, of course there was fat too, but nevertheless it visually became much larger. Well, in training you need to give all your best, for a start it is better to focus on the base, and then you already read a lot and go. I personally did Hemsworth's program (only 3 times a week).
And where did the restriction for 2 times a week come from? Athletes train up to 6 times a week, and during sports camps and several times a day.
If we are talking about distributed training of different muscle groups on different days, then I would like to exercise with weights (barbell and dumbbells) twice a week would suggest adding on other days complex bodyweight exercises - pull-ups and push-ups of various types, bridges, etc.
On the topic of bodyweight exercises, I really liked the book "Training Zone"