Doing short, simple strength workouts just twice a week might be enough to build muscle and get stronger — even if you're already used to longer, more intense routines.

If older people don’t get stronger from doing just one set of weight exercises, doing four sets instead might help them build more strength after training twice a week for 10 weeks.

If you take a one-week break from lifting weights halfway through a 9-week workout plan, you might lose a little bit of your strength gains in your legs, but your muscles won’t shrink any more than if you kept going, and your endurance and power won’t be affected.

If you're someone who's been lifting weights for a while, splitting your workouts into 2 days a week works just as well as doing them 4 times a week — as long as you're doing the same total amount of exercise over time.

If you're over 60 and lifting weights, doing it more than twice a week probably won't make you any stronger or give you bigger muscles than doing it just twice a week.

If you take a one-week break from your heavy leg workouts, your leg strength and ability to keep going during exercises won’t drop in any meaningful way — at least not if you’re already trained.