As with front crawl, to keep a backstroke stroke long the aim should be to reach as far down the pool as you
can before starting to pull. If your arms were the arms of a clock they should enter the water at around five to one.
The problem is, unlike front crawl you can’t actually see what you’re doing. Often, in trying to reach as far as possible,
people actually reach right over the top of their head thus shortening the stroke and planting the arm in a very weak position.