Strenuous exercise generally refers to excessive aerobic exercise or anaerobic exercise. Beginners don't do much exercise in the initial stage of fitness, and their bodies can't achieve enough aerobic consumption. Anaerobic resistance training is also in a familiar movement, they have mastered the essentials and will not have a heavy load. Therefore, they do not need branched-chain amino acids for the time being. Branched amino acids can be added in the early stage of protein powder as a supplement in the middle and late stage. There are various brands of fitness supplements in PQfitness on Taobao, which contain branched-chain amino acids from Optmund. You can go and have a look. I hope to adopt.