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 ...

After a long run or a strenuous lifting session, it feels good to stretch your muscles. In addition to preventing injury, stretching can also improve flexibility, making everyday motions a little ...

Our core is an area we are constantly working — whether it's during a workout, maintaining our balance when walking or stabilizing us during daily movement. Despite how much we use the core, ...

Jakob Roze, CSCS, is a health writer and high-end personal trainer. He is the founder and CEO of RozeFit, a high-end concierge personal training practice and online blog. Most people will experience ...

First thing in the morning, nothing hits like a big stretch. But what is it about rolling your shoulders and flexing your upper back that brings stress relief? We finally have an explanation, thanks ...

A new wave of research is showing what the old gym myths about stretching got wrong—and what you really need to do to reap its benefits. Some fitness experts recommend stretching before a workout, ...

Negative splits are a simple, yet elusive pacing strategy, and even the most experienced runners find them hard to achieve. But if properly executed, this pacing strategy can result in new PRs and ...