What is getting out of your comfort zone?
Getting out of your comfort zone with training doesn't always necessarily mean working extremely hard to the brink of throwing up. It can also mean working on the skills that you know are weaknesses. It's very easy for players to step on the court for practice and only work on the skills they are comfortable with. It's naturally in a player to show the best version of them self on the court even at practice or playing pick up ball at the gym. One of the best ways to become a more complete player is to work on weaknesses individually or in the off-season, but then also experiment and try these skills against actual competition. There will always be growing pains and times of embarrassment but eventually that will lead to confidence and success.
Take the next step!
There is a metaphorical wall that each player will eventually get to. This wall comes sooner to most in the form of conditioning and mental fatigue, but these are skills that need to be worked on just like ball-handling and shooting. Some players will train their body to get over that wall and quickly find out that there is another one up ahead. The players that are able to figure it out and train with purpose are the ones that will find the most success on and off the court. Sometimes it takes a person getting out of their comfort zone to become great because the feeling and satisfaction of success will rise to the top.