Stroke(划法)0:43 提到 “As you pull, aim to keep your hands inside your body-line.”
我倒覺得不一定，有的選手划手型態是沙漏或鑰匙孔(hourglass or keyhole)如MP，也有較直推的划法，是否要划在身線內，應視個人體能及游法而定，如壓胸深度，側吸or前吸等等因素(也許還有其他)。
➡ ➡ 中文旁白
Want to become faster and more efficient in the pool?
From hand positioning to arm placement, the butterfly stroke video covers the key elements you need to improve your butterfly stroke technique, complete with tips from the elite swimming coach.
Recovery雙臂雖應該直臂，但感覺有些太緊，不夠Relax ，可以看看 MP & Ian Crocker 比較一下 !
Want to reduce drag and conserve energy as you swim?
The butterfly positioning video provides key pointers on how to improve your head and body positioning in the water, and includes top tips from the elite swimming coach.
Want to improve your swimming speed and propulsive power?
Watch to learn how to refine your butterfly kick technique, with top tips from the elite swimming coach on foot positioning and generating power while swimming butterfly.
Want to master your breathing technique for a more comfortable, super-efficient swim?
The butterfly video demonstrates the most effective way to breathe while swimming butterfly, and features top tips from the elite swimming coach on how and when to take a breath.
Videos, Images from: www.speedo.com