The TikToker was very confused
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When working out, most people like to wear comfy clothes, that support their body as they move.
Depending on the weather or the type of exercise they're doing, the amount of clothing they put on might differ.
But you'd normally expect certain areas to be covered, right?!
This is why one woman was left rather baffled when she spotted a pair of open-back leggings for sale online that exposed part of the bum.
In a post on TikTok, the online shopper, known as @fathermarge, shared a snap of the leggings being modelled and demanded some answers.
Speaking in the video, the woman says she was on Fabletics and had credit to use when she came across the bizarre item.
The Savage X Fenty open-back leggings
"Umm… Can someone at Fabletics tell me what this is? Things are getting a little bit crazy."
The clip went viral, with many people flooding the comments claiming they worked at Fabletics and had never seen the leggings before.
After doing a bit of research, it seems the leggings aren't actually by Fabletics – but they do exist and are available to buy online.
They are from Rihanna's Savage X Fenty range.
The product is known as the soft mesh open-back crotchless legging and they cost $49.99 (£35) or $19.98 (£14) if you sign up online to become a VIP.
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The video clip has since been viewed over three million times and garnered over 477,000 likes.
One person replied: "Ummm?"
Another said: "Plumber cut!"
"LMAO WHAT," proclaimed a third.
Someone else commented: "OMG is this real? It can't be?"
"Every day we get further and further from the Lord," wrote a fifth.
A different user added: "I would laugh so much if I seen someone wearing that."
"This is too much," posted a seventh.
The Savage X Fenty leggings, with mesh lace trim, are described online as being perfect for "for the cosy night in."
The description adds: "Our Soft Mesh Open-Back Crotchless Legging features sheer soft mesh fabric that provides a comfortable fit and an open strappy back for a playful surprise."
A number of people have reviewed the product – and they all seem pretty happy with their leggings.
One shopper gave five stars, saying: "It is pretty clear these aren't the type of leggings you are going to wear to the grocery store, but as something sexy and different for around the house or to sleep in? These are unique, flattering, and really pretty! I love the back detail and even the crotchless design, you can wear panties under them or go commando and both are comfy options."
Another wrote: "I am in love with these pants. They're the perfect cross between sexy and comfortable. Not to mention the crotchless feature. I ordered a second pair."
A third agreed, admitting: "Ok, these are much more sheer and delicate than I expected but they are seriously sexy and feel incredible! I put these on under an oversized sweatshirt dress while hanging around the house and it was a nice little surprise for my fiancé when he found out what was going on underneath."
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