Reply to question asking what are the best drills to be used to promote swimming excellence. Drills are repetitive training activities which do or do not use equipment.
Drills are inappropriate training content for serious or highly-trained athletes.
Each drill that is practiced should be considered to be a discrete activity. The greater the similarity between a total competitive skill and a restricted practiced drill, the greater is the likelihood of negative transfer between the two. The learned drill will compete with and disrupt the competitive skill. The following are known about skill training. Unfortunately, the manner in which the body learns movements does not accommodate that assumption.