Easy, we develop our own.
All our coaches have trained as gymnasts at our gym, they only been exposed to our own gyms coaching methods and have never seen or heard negative or abusive coaching in their gymnastics journeys.
Unfortunately, this can work the other way. I have seen less than positive gyms whose staff is almost entirely composed of homegrown coaches who coach in much the same way they were brought up, including the high school kids coaching rec classes who speak unkindly to the kids. When outside coaches come in and try to ask questions and raise concerns they don't last long. So while I have no doubt it can and does work, and am certain your gym is a positive place, I don't think you can trust that just because a gym has a lot of homegrown coaches that it is a positive and healthy environment for your child.
I think overall gym culture has a lot to do with both raising healthy and happy kids and attracting good coaches who stick around. Is it a place where the kids value their coaches are respectful while also feeling safe to express concerns? Or is it an environment where the kids are so used to yelling that they only do what is asked of them when they are screamed at and threatened with rope climbs and otherwise misbehave? Is it a place where concerns are actually heard and addressed (coming from coaches, gymnasts, and parents) or a place where HC/owner is the authority on all and if you don't agree here's the door.
I think also gyms that have a healthy work/life balance for coaches AND athletes. I recently worked at a gym for many years that had just that and it was great for the coaches and kids and helped to keep kids in the sport longer. The team was very successful but also understood that kids deserved a life outside of the gym. Instead of a no days off mentality, coaches would cancel practice for community events important to the kids- homecoming football games, parades, trick or treating, or just a Friday night or Saturday off mid-season if they could see the kids & coaches needed a break. Or things like ending practice 20 minutes early for a game, treat, or fun to boost morale. I know that can be hard for gyms serving a larger number of school districts and areas to coordinate, but I think it can be done. It's quite a shock to me to see gyms that only close on Thanksgiving and Christmas day, have kids coming in on their off day for privates, make it difficult for coaches to take time off, pressure kids to keep doing more. I know some kids and coaches thrive in those types of settings, but so many just burn out.