Training your core isn’t just about being stiff and stable: core training is also about being elastic and malleable.
One of the most noticeable concerns I have from working with the endurance community is the amount of athletes who live day to day with niggles and injuries and don't address them
So how much does your new coach actually know about you? Have they taken the time to screen/evaluate how you move or function?
Coaches that are ignoring this type of training are missing out on one of the fundamental tools of athletic performance.
So what’s their secret? What’s the common factor that these athletes possess? What are these athletes including in their training that you probably aren’t? Plain and simple. They strength train.