the.com/quadriceps
Four muscles, one job: straightening the leg you keep skipping at the gym.
means The big four-headed muscle group at the front of your thigh that extends your knee.
from From Latin quadri- (four) plus caput (head), literally four-headed, after its four converging muscle bellies.
Squad goalsFour muscles: three vastus, one rectus femoris.
Knee bossSole reliable straightener of your knee joint.
Stair taxPowers every step up, fights gravity going down.