What does no gains without pains mean?

The phrase "no gains without pains" means that achieving success or improvement often requires hard work, effort, and sacrifice. It emphasizes that progress and rewards do not come easily and that challenges or discomfort are usually necessary steps toward reaching one's goals. This concept is commonly applied in various contexts, such as fitness, education, and personal development. Ultimately, it highlights the importance of perseverance and resilience in the pursuit of achievement.