How you stand when the coach is talking to you - do you stand up straight and tall, and make eye contact? Or do you play with the ball you are holding, look around the gym and slouch to the side?
Both of these convey a strong message not only to your coach, but to your teammates and anyone else watching.
Everything that you do makes others form an opinion about you, either good or bad. Everything that you do conveys to other people, and importantly to yourself, what kind of person you are.
How do you want others to think of you? And importantly, what kind of person do you want to be?
How you greet your teammates and coaches - do you make eye contact, do you have a strong clear voice?
When you are doing sprints, do you just cruise or jog through it, and ALMOST touch the lines? Or do you push yourself as hard as you can to do it as well as YOU can, and touch every line?
Your body language, effort, approach and attitude to any and every task that you do, in and out of basketball, tells the world who you are.
Why not make a habit of doing everything as well as it possibly can be done? Don't be mediocre, don't fit in. Stand out by committing to excellence in everything you do.