There are coaches who are effective with athletes. Some work well with older people, others with disabilities, and others with older people. You need to know what you are looking for.
What kind of coach do you want? If you are a 50-year-old girl and hired a trainer who is interested in working with young bodybuilders, you are sure to be disappointed in your workout.
You can visit https://juliedelabarre.com/ to choose an online fitness trainer.
Just wanting to know what certifications or degrees they have doesn't mean there aren't great coaches out there who don't have the best qualifications, but the quality of education is a pretty good indicator of commitment to progress.
You don't want to slide with maximum-minimum instructions. So are you continuing to learn and keep up with the latest teaching methods?
How do your current and previous clients feel about you?
Could they have enough customization hours to fit your program? They have to match you; you don't need to customize it.
Are they reliable and instantaneous?
Is it time for a meeting? After all, you will probably pay them for their time so they should be thereafter they tell you.
And you are downloaded. Once you've committed to personal training and found a coach to work with, there are a few guidelines you'll want to follow.