WASHINGTON - Every time you stand up from a chair, climb a flight of stairs, or catch yourself before a stumble, your thighs ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Ready for leg day?

Anatomy Of The Quads As the name suggests, the quadriceps consist of four muscles (heads), says Nguyen. All four heads are located on the front of the thighs and insert into the patella via the ...