Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Functional freeze is a defensive survival response ...

I have taught spin classes for four years, but the majority of my friends have never taken one—they're just not "class" people. Everyone works out differently and classes are a very specific kind of ...