Almost everyone benefits from strength training — if someone doesn’t see gains in one area or one round of training, they likely will in another. Real 'non-responders' are super rare.

Just because someone doesn't gain muscle in one workout phase doesn't mean they never will—everyone eventually gains muscle with enough training over time.

Among older adults who do resistance training, some people gain strength even if their muscles don't get bigger, and this pattern occurs in about 38% of cases, showing that improvements in muscle size and strength do not always happen together.

Some older people’s muscles grow when they lift weights, and others don’t — this claim says that changing how many times you lift can tell the difference between those who grow and those who don’t, based on how much their thigh muscle size changes after just one set.

About 19% of older adults who don't gain muscle from resistance training still don't gain muscle even when they do more sets, suggesting their bodies may have biological limits that training volume alone cannot overcome.

Right now, scientists don’t agree on how to diagnose or study overtraining in weightlifting, so it’s hard to tell the difference between being productively tired, overly tired, or actually burned out.