In my core training I have been trying to hit as many muscles as possible. I am also trying to mix up the exercises and not do the same ones every session.
My training looked like this today:
Windmills- 24kg bell - 5 reps each side
Ab Wheel - 10 reps
Back Extensions - 16kg bell - 10 reps
Gladiator - 12kg bell - 30 seconds each side
Hanging Leg Raise - 10 reps
I did the above circuit 3 times