Muscle imbalances/ 基因,我記得睇過篇journal話上代有acl torn嘅血親有acl torn嘅機會率係冇嘅4倍,之後COL5A1有TT genotype嘅人係極不容易有traumatic ligament/tendon injury,但係有趣嘅係TT genotype喺AMPD1/GDF5 genotype入面喺可能會有高啲機會傷(同CC/CT對比),有COL5A1 genes嘅人會有大啲機會傷acl同achilles tendon, tendon傷同MMPs+tenascin呢啲enzymes+ proteins都有關係,所以沙哥呢啲鐵人應該係基因禮物