In this video from the NSCA's 2013 Coaches Conference, Ron Hruska, MPA, PT, and Mike Arthur, CSCS, discuss postural restoration and its importance in terms of an "inside and out approach to strength training."
Former President of the NSCA Greg Haff talks about how views on periodization have changed, and the importance of periodization for coaches and athletes to see consistent performance, in this 2018 National Conference video.
This excerpt from Exercise Technique Manual for Resistance Training, Third Edition goes over the technique and execution in each phase of the push jerk.
With each experience of training a new client comes an opportunity to research, consult, and learn something new. The career-driven personal trainer will learn from their mistakes, build on their successes, and utilize their knowledge base with each new client they encounter.
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Exercises performed in the water that improve swimming skills and simultaneously work the core can be beneficial for swimmers. One particularly useful core exercise that is specifically designed for swimmers is a kickboard progression, such as the one described in this article.