Seated multi row machine

Maintaining a steady stream of members is considered the hardest part of owning a gym. However, if you retain your members through excellent customer service, great gym equipment, creating a welcoming environment, and helping them achieve their goals; then, retention rates are better and they'll be far more likely to recommend you to friends and family. Therefore, do a good job and be nice, and people will keep coming.

For me, both the hardest and easiest part of owning a gym is when your passion becomes a job. You'll work tirelessly to make it work, but make sure you continue to enjoy doing so, by keeping up with your training and doing things gym-related that interests you, too.