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.

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.

Everyone can build muscle with consistent strength training over time — if you didn’t gain muscle once, it’s probably not your genes, just that specific training phase didn’t work for you.

People who didn't work out at all for 20 weeks didn't get stronger, more tired-resistant, or more muscular — so if others who did work out did get better, it's because of the exercise, not just because time passed.

If older adults do not gain muscle from regular weight training, doing more sets and reps might help them finally start building muscle.