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.

Lifting heavy weights to the point of exhaustion three times a week for six weeks makes untrained young men much stronger than lifting lighter weights, even though both types of training build similar amounts of muscle size.

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.

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 heavy weights until you can't lift anymore makes young male athletes much stronger than lifting lighter weights over 8 weeks, showing that heavier loads train muscles and nerves better.

For beginners lifting weights, pushing muscles to complete exhaustion doesn't build more muscle than stopping just short of exhaustion, as long as the total amount of lifting is the same over 8 weeks.