Next time you consider ditching the gym in favour of a pizza and a film (for the fifth consecutive day) spare a thought for your mind.
Regular exercise - even light exercise such as going for a walk or gardening - may help prevent depression in later life.
Analysing the results of 26 years' worth of data, researchers found that 25 out of the 30 chosen studies mark a correlation between lack of exercise and depression in later life.
"I'm active so I wasn't surprised to find this, but 25 out of 30 showed a significant effect and that was unexpected," says George Mammen, Ph.D. candidate and co-author of the study.
19 Ways To Move More This Weekend
Take A Swim(01 of19)
Open Image ModalYou don't have to be Rebecca Adlington to get a water workout. Even some leisurely splashing around can shave off 200 calories, and it's a great way to stay cool in the heat, too! (credit:Alamy)
Stand At The Bar(02 of19)
Open Image ModalMini Golf(03 of19)
Open Image ModalDance(04 of19)
Open Image ModalLet the music move you when you're out on Saturday night. A little boogying can burn 150 calories in just 30 minutes. (credit:alamy)
Throw A Frisbee(05 of19)
Open Image ModalGo On An Exercise Date(06 of19)
Open Image ModalPlay Fetch(07 of19)
Open Image ModalCatch Up On A Walk(08 of19)
Open Image ModalIf you've made plans to meet a friend for coffee, take your catch up session to-go instead and gab on a walk. Even strolling at a snail's pace will burn 85 calories in 30 minutes! (credit:Alamy)
Play Pub Games(09 of19)
Open Image ModalTake A Hike(10 of19)
Open Image ModalGo Window Shopping(11 of19)
Open Image ModalVisit A Museum(12 of19)
Open Image ModalSpend some time strolling through the halls and galleries of your favorite museum. You'll give your brain a workout while you're at it! (credit:Alamy)
Get A Takeaway Instead Of Delivery(13 of19)
Open Image ModalPick your favorite nearby joint and walk to pick up your meal. (credit:Alamy)
Wash The Car(14 of19)
Open Image ModalSure, it might take a little longer than sitting through the drive-thru, but you get the pleasure of working those muscles a little bit. (credit:Alamy)
Cook(15 of19)
Open Image ModalTidy Up The Garden(16 of19)
Open Image ModalTake A Bike Ride(17 of19)
Open Image ModalGo Bowling(18 of19)
Open Image ModalStart A Wii Fit Competition(19 of19)
Open Image Modal"If you're not physically active, you should start," Mammem tells NBC News. "We usually think of exercise in terms of weight and how we look, but it's also a way to maintain mental health far into the future."
The study was carried out at The University Of Toronto and published in American Journal of Preventive Medicine.