If you're someone who regularly lifts weights, doing more triceps exercises each week might help your triceps muscles get a little bigger—but only a little, and not as much as it helps your biceps.

If you're already strength training and you do more sets of bicep exercises each week, your biceps tend to get thicker — and this link isn't just luck, it's a real pattern.

If you're already strength training and you suddenly do more than 50% extra workouts per week, your biceps and triceps might grow a bit more—but if you only increase a little or even cut back, you won't see a big difference in muscle size compared to those who ramped it up a lot.

If you're lifting weights regularly, doing more reps and sets might make your biceps grow bigger, but it doesn't seem to help your triceps grow as much—your arms might just respond differently to extra work.

Two different weightlifting styles—one focused on heavy weights with long breaks, the other on lighter weights with short breaks—both grew arm muscles about the same amount when people lifted the same total amount over 8 weeks.

When you do two different styles of weightlifting—one with heavy weights and fewer reps, and one with lighter weights and more reps—but match the total amount of work done, both can make your arm muscles grow just as much after 8 weeks.