Originally Posted by kitten_Val
You are right. And here is come the question though... I've seen lots of advices on doing lots of circles (which has a good reasoning behind it, so I don't argue here). However if the horse is not straight and forward to start with, wouldn't be much easier to achieve the straightness (and forward motion) on straight lines first? And when one has that in place go to the circles and serpentines to improve other "flows"...
P.S. OP, sorry for hi-jacking your thread a little...
Straightness/ crookedness was discussed... Crookedness
The problem is in understanding exactly what straightness really is. It has nothing to do with working on a straight line as opposed to a curving one.
Straightness has everything to do with the horse being straight ( in that each part of its body aligns behind the part in front). It means in short that the hind leg matches the track of the foreleg when the horse is in motion.
This is why you have seen us write the horse is crooked when a shoulder falls in or out for the opposite hind leg is in fact deviating from the straight tract to the outside of the track made by the front leg. This can be because of weakness in that leg, an injury, crooked riding or a propensity of the horse to favor one side.
The simplest correction to crookedness is to sit as evenly as possible and drive the horse forward. Only if unusual circumstances prevail will the rider need to resort to more complicated corrections.