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Site: Anterior lateral thigh
Targeted muscle: Vastus lateralis
Origin: Greater trochanter and linea aspera of femur
Insertion: Patella through quadriceps tendon; tibial tuberosity via patellar ligament
Action: Extends leg at knee joint
How to locate: Place one hand on the lateral aspect of the thigh, place another on the top of the knee. With outstretched thumbs, the area where the hands can grasp is the Vastus lateralis
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Site: Upper arm
Targeted muscle: Deltoid
Origin: Acromial extremity of clavicle, acromion of scapula and spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Lateral fibers abduct arm at shoulder joint; anterior fibers flex and medially rotate arm at shoulder joint; posterior fibers extend and laterally rotate arm at shoulder joint
How to locate: Palpate the acromion (outer edge of the scapula) and trace an imaginary inverted triangle below the shoulder.