Doing a lot of reps with lighter weights right after each other makes your legs feel way more tired right after than doing fewer reps with heavier weights.

Doing lots of reps leaves your muscles weak for days, but doing fewer heavy reps doesn’t make you weak for long.

After a heavy leg workout, men can't push as hard with their legs for at least two days — even though they're trained, their strength is still a little weaker.

More reps don’t break your muscles more than heavy lifts — but they do make you more stressed and tired right after.

When trained guys do lots of reps, they feel more tired, weaker longer, and more stressed than when they do fewer heavy reps — even though their muscles are damaged about the same.

When doing intense leg exercises with 5-minute breaks between sets, people can do more total work than with only 2-minute breaks, because their muscles recover better.