
i normally only do 3 different exercises, so i always try to do a transverse abdominis and crunch exercise, then alternate on whether i do oblique or lower ab. the circuit is very minimal rest in between exercises but take a min to stretch in between circuits. after i do it twice i do a minute plank, you can do shorter or longer or weight it, whatever you want.
also the point of having choices is i get really bored, especially if im doing abs thrice a week. i need variety. also DO THE EXERCISES YOU ENJOY!!! i hate cable crunches so i never do them, i just figure out what i like and what im feeling that day, and as long as your working your muscle it will work overtime