When I do planks, and some other exercises that require a higher level of stability than average, the trainer always tells me that my core is weak, and that I need to make it stronger. Can any of you ...
Balance is important: studies have shown it helps prevent injury (for example, this study (in Spanish)), it's useful when transitioning to barefoot/minimalist running (see this or this) and ...
I do a fair amount of weightlifting; in particular heavy compound lifts power-lifting style. I also compete on a target pistol team. Over the years, I've heard a number of coaches and marksmen ...