help with assiment (abb crunches) (1 Viewer)

[mitch0609]

i got a assiment for pe and im confused with a part of it

we got givine certain exersices and we had to answer questions about the exercises. these are the ones that im confused over.

What joint action(s) are being performed while completing the exercise?
What is the agonist Muscle group in this exercise?
What is the antagonist muscle group in this exercise?
What is the origin of the agonist identified
What is the insertion of the agonist identified?

i understand what the questions are askin but they confuse me because abb crunches arnt as simple as an exercise like a leg curl or bicept curl.

thx in advanced

mitch