What are the most common mistakes when trying to create impulsion in dressage?

The most common mistakes in creating impulsion reflect predictable misunderstandings of what impulsion is and how it develops, and identifying them specifically allows riders to recognize when their training approach is working against rather than toward the quality they are seeking. Confusing speed with impulsion is the most fundamental mistake: pushing the horse faster produces a horse that covers more ground per minute but rarely produces the elastic, stored energy quality that impulsion describes, and often produces tension that further prevents genuine impulsion from developing. The opposite mistake — allowing the horse to go slowly without establishing genuine hindquarter engagement and elasticity — produces the dead-feeling, sluggish work that lacks both pace and genuine impulsion. Using constant leg pressure rather than definitive aids followed by complete releases is a very common error that produces a horse that becomes progressively more resistant to the leg because it learns to tune out the constant background pressure, requiring increasingly strong aids to produce any response. Attempting to create impulsion through rein pressure — pulling the horse's head down or restricting the front end in an attempt to push the horse more uphill — blocks the very back swing and throughness that impulsion requires, producing a horse that is more compressed but less energetic. Neglecting the forward component after a half-halt or transition — slowing the horse and then not riding it clearly forward — teaches the horse that slowing means reducing energy rather than redirecting it, producing a horse that loses impulsion in every transition and half-halt rather than developing more through them. And pursuing impulsion through driving aids that create tension — strong whip applications, spurs applied with sustained pressure — may produce more forward movement in the short term while creating the back tension that prevents genuine impulsion from developing because a tense horse cannot swing through its back in the way that genuine impulsion requires.