It makes sense to ensure your routines before keiko align with what science has to say about improving performance and preventing injuries.
Studies cited in this video:
Sit-and-reach flexibility and running economy of men and women collegiate distance runners: http://1.usa.gov/1JNJ8iY
Effect of Acute Static Stretch on Maximal Muscle Performance: A Systematic Review: http://bit.ly/1FRxIQg
A Large, Randomized, Prospective Study of the Impact of a Pre-Run Stretch on the Risk of Injury in Teenage and Older Runners: http://bit.ly/1JNJh65
Does warming up prevent injury in sport? The evidence from randomised controlled trials: http://1.usa.gov/1iXMhY7
The effectiveness of neuromuscular warm-up strategies, that require no additional equipment, for preventing lower limb injuries during sports participation: a systematic review: http://bit.ly/1JNJnuo
Effects of different types of warm-up on swimming performance in collegiate swimmers: http://bit.ly/1WHdWLK
Effects of warming-up on physical performance: a systematic review with meta-analysis: http://1.usa.gov/1PehNh6
Relationship between alertness, performance, and body temperature in humans: http://bit.ly/1KVlw06
Dojo etiquette disclaimer: If your sensei tells you to do things a different way, please follow the instruction of your own sensei.