Fixing the Flaws

Fixing the Flaws is a very interesting read on "the ten most common biomechanical weak links in athletes." A sample (emphasis added):

Weak Posterior Chain: Big, fluffy bodybuilder quads might be all well and good if you're into getting all oiled up and "competing" in posing trunks, but the fact of the matter is that the quadriceps take a back seat to the posterior chain (hip and lumbar extensors) when it comes to athletic performance. Compared to the quads, the glutes and hamstrings are more powerful muscles with a higher proportion of fast-twitch fibers. Nonetheless, I'm constantly amazed at how many coaches and athletes fail to tap into this strength and power potential; they seem perfectly content with just banging away with quad-dominant squats, all the while reinforcing muscular imbalances at both the knee and hip joints. The muscles of the posterior chain are not only capable of significantly improving an athlete's performance, but also of decelerating knee and hip flexion. You mustn't look any further than a coaches' athletes' history of hamstring and hip flexor strains, non-contact knee injuries, and chronic lower back pain to recognize that he probably doesn't appreciate the value of posterior chain training.

Also:

Lack of Overall Core Development: If you think I'm referring to how many sit-ups an athlete can do, you should give up on the field of performance enhancement and take up Candyland. The "core" essentially consists of the interaction among all the muscles between your shoulders and your knees; if one muscle isn't doing its job, force cannot be efficiently transferred from the lower to the upper body (and vice versa).

(One of the things I really like about the Infinite Intensity program is that it's complete "knees to shoulders" work is excellent, if not the dominant focus of the program.)

Bonus: the "weak grip" section links to this excellent grip training article.