If you're a guy who's been lifting weights for a while, doing squats more often during the week—like four times instead of two—might feel easier and less tiring, especially after a few weeks.

If experienced guys do more sets of squats in one workout—like 5 or 6 instead of 2 or 3—they’ll feel more tired during that session, even if their total weekly workout volume stays the same.

For men who already lift weights, doing either high-intensity or high-volume workouts for 8 weeks didn't make a big difference in leg strength or muscle size.

If you're a guy who's been lifting weights for a while, working out each muscle four times a week doesn’t make you stronger than doing it twice a week—as long as you're doing the same total amount of work.

If you're a guy who's already used to lifting weights, doing heavy sets with long rests works just as well as doing more reps with shorter breaks when it comes to getting stronger in the squat after 8 weeks.

Even if you’re already strong—squatting almost twice your body weight—adding more sets will make you stronger, but won’t make your muscles grow more than doing a moderate amount.