At my old pool there is a sign on the wall that reads "Practice makes permanent." I definitely agree with this statement. We develop habits in practice and we need to make sure that we are developing helpful habits in regards to our movement patterns.
On a daily basis I observe athletes working out. Those who I coach and those who are merely working out in the same facility. I love the interaction with my athletes and seeing them achieve technical proficiency. All their hard work is productive.
On the other hand, it's hard to hold back from offering some advice to those I am not coaching, especially when I suspect that a movement (exercise) or sport technique may result in some kind of injury. Importantly, I only intervene under certain circumstances. On the lighter side though, it's usually just optimal performance that is at risk when sub-optimal (maybe even bad) technique is repeated.
As well, sometimes a good situation arises and a conversation starts and I find that the person is really interested in working with a coach!
Every great athlete has a coach. A good coach offers objective feedback and guides his athletes in their movements and develops the athlete in terms of technique. Self-coaching is definitely a challenge. But so many folks choose this route.
So I will offer this advice. Consider working with a coach. Your goal in working with your coach is to gain technical proficiency through good feedback. Program planning and workouts that develop your ability to compete with the highest level of bio- mechanical efficiency a.k.a. technique!