You can do this workout in your sleep. No, really.

A London fitness chain launched a “40 Winks Workout” on Saturday that literally consists of crawling into bed and taking a 45-minute nap.

The “Napercise” class at David Lloyd Clubs is mostly targeted to exhausted parents, who will curl into a cot for restorative sleep that is also supposed to reinvigorate the mind and body. They’ll lower the studio temperature to be chillier than usual to promote calorie burning while you rest, too. So you snooze, you lose.

The latest work out? Getting 40 winks at “Napercise.” (David Lloyd Clubs)

More than 100 people signed up for the trial “Napercise” sessions, a spokeswoman confirmed to Moneyish. If it’s a success, future drool sessions will be included in the clubs’ $100 monthly membership fee.

Napping isn’t even the most ridiculous so-called “fitness” trend sweeping the health circuit right now. There’s also crawling.

Yes, scrabbling about on all fours helps strengthen the core, chest and triceps, according to the Original Strength fitness center, which hosts pop up workouts in North Carolina where grown men and women crawl across the ground like babies.

Looks like our very own Tim Anderson is up for the #bearcrawlchallengesweepstakes — except maybe not as a bear crawl 😉 — Did you know that Tim crawled 1 mile non-stop?! I think that definitely deserves a shout out and some consideration from @underarmour and @Kohl's !!! #crawlon #somuchmorethanjustexercise #originalstrength #pressreset #kingofcrawling #showushowitsdone — #Repost @tim_sonofander with @repostapp ・・・ Why not, right? #bearcrawlchallengesweepstakes #kohls #crawlingsince1975 #originalstrength #pressingreset #noshameinmystrength #danialmeydajustboughtmyshoes #crazyenoughtowork **************** 👉👉👉@theellenshow let us crawl with you and talk about how beneficial crawling really is!

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And the Zuu classes in the U.K. take cues from the animal kingdom for primal moves like donkey kicks and frog hops – as well as bear crawls.

Or try working your ax off by throwing hatchets in New Jersey. Stumpy’s Stumpy’s Hatchet House lets you hurl axes at targets for two hours at just $40 a pop. Each session begins with a quick course in safety, and then you can get your lumberjack or jill on. Just don’t wear open-toed shoes. Visits have nearly tripled since it opened last year, the owner told the “Today” show.

Double handed pizza throw 🍕 🎯😀 #socialthrowdown

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Pittsburgh Steelers linebacker James Harrison prefers whacking tires with sledgehammers, though.

And then there’s yoga. The ancient art of mindful breathing while doing core work and stretches meant to open and restore the body now also includes Bier Yoga in Berlin, where you sip suds in between poses. You pay $5 for the class, and $5 for two beers. “BierYoga is supposed to be fun, but it is not a joke,” they write on their site. “We combine the philosophy of yoga with the pleasure of the drinking of the beer.”

Or do down-dogs on dope with ganja yoga in California, where yogi and author Dee Dussault leads $30 “Smoke and Stretch” and “Vape Restorative” classes that include all levels of meditative yoga “enhanced with sun grown organic flower, C02 vape pens or paleo edibles.”

But the most ridiculous fitness craze of all at the moment has to be goat yoga in New Hampshire, where the Nottingham studio lets five baby Nigerian goats loose on a seven-person class. The little goats sniff yogis’ hair, and even bound on their backs during the class, making most members laugh. The levity supposedly helps lower blood pressure and make intimidated yogis feel more comfortable in their poses. There’s a 350-person wait list for the class.