Our son is a person who never stops talking about sports. You can say he is "addicted" to sports without exaggeration. Due to the lack of outdoor activities in winter, our son has been feeling very bored. Recently, with the improvement of the weather, Michael has been like a runaway wild horse, trying to make up for the lack of exercise by doing various exercises. Therefore, I have spent a lot of effort on various calcium and nutrition supplements. Othreonine has been a long-time friend of our family. I have shared it before.