What does "leaner, and tighter" mean in this context?

Native speaker’s answer
Rebecca
In this context, "leaner and tighter" is a metaphor for businesses being "healthy." "Leaner and tighter" are often used in association with fitness and health and improving one's health. So the process made them leaner and tighter, able to operate better, like a healthy body. Ex: The management changes seemed to make the store leaner and tighter. Healthier and better than it was before. Ex: I'm doing a fitness challenge so I can become leaner and tighter.