When you train your upper and lower body, your muscles don't all grow at the same rate. To get the best overall results, you probably need to adjust how much you train each specific area instead of using the same routine for everything.

Different parts of your body don't grow muscle at the same rate when you lift weights. Because your upper and lower body respond differently to workouts, you might need to adjust how much you train each muscle group to get the best results.

If you do a workout that targets both your upper and lower body, your muscles in those areas won't grow at the same rate or in the same way. Research shows that most combined workout routines lead to noticeably different muscle growth patterns between your arms and chest compared to your legs and glutes.

If you're new to lifting, doing just a few sets per workout might be enough to build upper body muscle — doing more sets probably won't give you much extra benefit.

If you lift weights more each week for each muscle, you’ll likely gain more muscle size—studies show about 3.9% more growth compared to doing less.

Lifting heavy weights and lifting lighter weights can both build muscle just as well for different people, as long as you do the same total amount of work. It suggests that how hard you push might not be the main thing that matters for muscle growth.