Supergirl arms, legs, abs.

Do just one body part or all three if you're ambitious.

Scene takes place at CatCo or you see Cat Grant
          .....30 second plank
          .....15 backward leg lifts each side
          .....20 bicycles  

Superpowers
          .....15 tricep pushups
          .....20 sumo squats
          .....20 oblique/side crunches each side

Fight or training
          .....10 push ups
          .....20 jumping jacks
          .....10 straight leg lifts

Scene takes place at Kara's apartment 
Other Superman reference or lore
          .....15 lateral arm raises
          .....15 forward leg lifts each side
          .....10 reverse crunches

Awkwardness between two characters 
Flirting
          .....20 bicep curls
          .....30 calf raises
          .....20 crunches

Scene takes place at the DEO headquarters  or DEO is discussed
          .....15 shoulder presses
          .....30 second wall sit
          .....20 Russian twists