Winter is a good time to gain muscle. First of all, we should maintain the intensity of training and increase the intake of protein. As for whether to increase the weight, it depends on whether it is necessary to increase it. Exercising muscles is not lifting weights, and muscle stimulation does not require extreme weight. You use a lot of weight to run out prematurely or need help to lift it. It won't get better results than completing the whole training with relatively just weight. On the contrary, the former is worse. Therefore, to maintain the original training weight, only equal strength will naturally increase. Then increase the training weight. Using the weight of 100% to push 1~2 times is much worse than using the limit weight of 70%~85% to do 12 times.