If you're new to lifting weights, how muscular you already are doesn't really predict how much you'll grow from training — it's not a strong clue.

If you're a healthy man between 18 and 40 years old, your starting height, weight, and age won't really change how much muscle you build from working out. Basically, everyone in this age group tends to gain muscle at roughly the same rate when they follow the same training plan, no matter their body size.

Even if you don't get noticeably bigger from lifting weights, resistance training still helps you build muscle and get stronger in your legs and lower body. Everyone benefits, no matter how little they grow.

Individual hypertrophic responses to resistance training are highly variable across muscle groups and are not consistently correlated between upper and lower body musculature.

When people gain muscle from resistance training, the amount of growth varies between muscles, and these differences are partly linked to how similar the responses are across muscles, but much of the variation comes from personal biological traits unrelated to the workout itself.

People might respond differently to how much weight training they do, but we can't say for sure because the studies done so far aren't clear enough.