Some of my favorite quick AB exercises!

 In-n-outs

3 sets of 30

Alternating crunch with 10# weight

2 sets of 40

Impossible sit-up

(My dads creation to work out from the top of ribs to lower pelvic area)

2 sets of 100 

 

Russian twists

2 sets of 30 each side

And the dreaded Plank

3 sets of 1-2 min hold/pulse tucks for last 30 seconds