The Internet is a treasure trove of all sorts of challenges, from weird to interesting. The latest inclusion to that list is Flex challenge and it has everything to do with the flexibility of your ...

Curls are the classic gym bro exercise, and a bicep flex is the most iconic way to, literally, flex on someone. But does it matter what type of curls you do? And are there non-curl ways to get some ...

Now, if you want to complete the Flex Challenge you'll need some flexibility. Perhaps even a warm up first. First, the person will need to lie on the floor stomach down with their hands firmly behind ...