If a woman who's already fit does strength training, doing 5 to 10 sets per muscle each week might build more muscle than doing even more sets—like 15 or 20. Sometimes, more isn't better when it comes to muscle growth.

If women who already work out do too many sets each week, they might gain less muscle and strength than if they did fewer sets.

If you're a woman who's already been working out, doing 5 to 10 sets of strength training per muscle group each week seems to be enough to build muscle and get stronger over half a year — doing more doesn't seem to help extra.

If you're already experienced with weight training, doing 5 to 10 sets per muscle group each week builds just as much muscle and strength as doing 15 to 20 sets—so going over 10 sets won't give you extra gains.

For young women, doing lighter weightlifting for 10 weeks can build leg muscle just as well as heavier lifting, with muscle growth between 3% and 12%.

If you're already fit and lift weights, doing 5 to 10 sets per muscle group each week builds just as much muscle and strength as doing 15 to 20 sets—so going overboard doesn't help you get bigger or stronger faster.