Muscles

I'm using what I believe to be the best short plural word for each muscle or group of muscles.

Arm

Biceps, Elbows, Forearms, Triceps

Shoulder / Back / Chest

Deltoids, Latissimi, Pectorals, Rhomboids, Serratuses, Spinatuses, Tereses, Trapeziuses

Midsection / Hip

Abdominals, Gluteals

Leg

Calves, Knee, Shin, Thigh