Which action requires the most muscles to complete ?

Question

(a)smile

(b) jumping

(c) frowning

Answer 1

frowning. I heard this on a commercial a ways back because it takes more muscles to frown than smile so everybody should be smiling. Definitely not jumping if the question is asking for the most number of muscles. I know it is frowning!

Answer 2

(a) Smile. 12 muscles. Zygomaticus major and minor (4), Orbicularis oculi (2), Levator labii superioris (2),  Levator anguli oris (2) and Risorius (2)

Answer 3

Jumping by far. Just do the action, and you will feel that your back, legs, and abdomen will all tense.

Answer 4

I think smiling requires a lot more muscles of facial expression than even jumping, clearly I can't name them all, but I reckon that between risorius et al, smiling is a tough thing to do.  But then again, so is frowning, so I'm not sure.