Sports science advances, training regiments improve, coaching schemes gain sophistication, conditioning capabilities increase and practice procedures progress.
It said the reason was largely attributable to changing medical practice, including "progress in medical technology and the provision of alternatives to hospital admission".
Different ones apply more powerfully at different times, and you can practice one and then another as you progress to become a more effective communicator.
As you progress through the initial months of observation required in an apprenticeship, you will enter a critical stage: practice toward the acquisition of skills.