Let’s talk about the Science!!!
Based on science and not my opinion. we have several weak links in our body. From the ground up, the calcaneofibular ligament is weakest and most often injured when the foot is inverted as is typically injured alongside with the ATFL.
At the knee joint, the quadriceps are strong from a 3:2 ratio according to the National strength & Conditioning association and vladamir janda discovered this through his research over his years as a physician. The biceps femoris(hamstrings) is most often injured, and according to the literature, hamstrings are most often injured in AFL and Rugby due to a rapid acceleration during high speed running placing the greatest musculotendinous stretch on the bicep femoris and also due to the deceleration of running during sport.
Mendiguchia, J & Brughelli, J, 2011, A return to sport algorith for acute hamstring injuries, Physical Therapy In Sport, vol 12, pp-2-14.
Hiederscheit, B, et al., 2010, Hamstring Strain Injuries: Recommencatinions for Diagnosis, Rehabilitation, and Injury Prevention, JOSPT, Vol 40, number 2, pp 67-80.
Foreman, T.K. et al, 2006, Prospective studies into the causation of hamstring injuries in sport: a systematic review, Physical therapy in sport, vol. 7, pp. 201-206.
At the lumbar spine, the Anterior longitudinal ligament is twice as thick as the posterior longitudinal ligament(PLL), the L4-S1 is the most often injured because the discs between L4/L5 and L5/S1 sits slightly posterior and laterally anatomically based on how we are built. Also posterior annulus is thinner and weaker comprised of weaker type I collagen fibers making it susceptible again for injury particularly at the disc.
At the shoulder joint the external rotators are biomechanically weaker not only in individuals but with athletes as well, particulary pitcher and volleyball players.
Escamilla, R, et al, 2009, ÔÇÿShoulder Muscle Activity and Function in Common Shoulder Rehabilitation Exercises,’ Journal of Sports Medicine, Auckland, Vol. 39, Issue. 8; p. 663.
Wang, H.K., & Cochrane, T, 2001, ÔÇÿMobility impairment, muscle imbalance, muscle weakness, scapular asymmetry and shoulder injury in elite volleyball athletes,’ Journal of Sports Medicine and Physical Fitness. Vol. 41, No. 3, pp. 403-409.
At the cervical joint, there is more movement that occurs at C5-C6, and is where most individuals have DDD or disc injuries that any other area in the neck.