Heavy vs Light Weight for Muscle Building ❓

24 Jan 2026 · 1 min

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1:06

In this concise video, fitness coach Eric Roberts addresses the common question of whether to lift heavy weights for fewer repetitions or lighter weights for more repetitions. He explains that the appropriate approach depends on the type of exercise: compound movements such as bench press, deadlift, hip thrust, and rows should be performed with heavier loads in the 5‑10 rep range, while isolation movements like bicep curls, tricep extensions, shoulder raises, and leg extensions are better suited to lighter loads in the 8‑15 rep range. He emphasizes that even with lighter weights, the load must still be challenging for the target rep range to stimulate muscle growth. Finally, he directs viewers to a free workout program linked in his bio.

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If you're somebody who lifts weights, should you be lifting heavy weight for less reps or light weight for high reps? Well, it depends on the exercise that you are doing. There are 2 types of exercises: compound exercises and isolation. Compound exercises are exercises like bench press, deadlift, hip thrust, rows. For these exercises, you should be lifting heavier weight in the 5 to 10 Rep range. Then for your isolation exercises like bicep curls, tricep extensions, shoulder raises, leg extensions, you should be lifting lighter weight in the 8 to 15 rep range. But here's the most important thing: even when you're lifting lighter weight for higher reps, you still want to pick a weight that is heavy and challenges you for the rep range that you are doing, because that's how you build muscle. And if you need a free workout program from you can follow, click this link in my bio.