Latissimus dorsi
Musculus latissimus dorsi · Široký sval zádový
Muscles
Looks like
The broadest muscle of the back, a flat triangle from the lower spine and pelvis sweeping up into the armpit.
What it does
Pulls the arm down and back — climbing, rowing, swimming and pushing up from a chair.
Keeping it well
Strengthened by pulling exercises. A sudden tear while throwing or climbing is rare; pain and a bruise under the armpit need checking.