When young men who don't normally lift weights do heavy weight training, they get stronger at lifting heavy weights compared to doing light weight training. But both heavy and light training make their muscles equally strong when pushing against something that doesn't move, showing their brains and nerves adapt specifically to the type of training they do.

Lifting heavier weights makes untrained men much stronger than lifting lighter weights over 8 weeks, even if both types of training are done until you can't lift anymore.

Lifting heavier weights makes your brain and nerves work better to help you get stronger faster than lifting lighter weights, especially for guys who are new to working out.

Lifting heavy weights until you can't lift anymore makes young male athletes much stronger than lifting light weights over 8 weeks, even if both make muscles grow about the same size.

If you lift the same total amount of weight, lifting heavier weights (80% or more of your max) makes you stronger in a single big lift than lifting lighter weights—but lifting very light weights and light weights (under 60%) give you about the same strength gains.

Lifting heavy weights three times a week for six weeks makes untrained young men much stronger than lifting light weights, even though both groups gain about the same amount of muscle size.