Should I add abs to routine?

Hello everyone. I am thinking about going back into the gym after a long break. Here is my routine so far.

Day 1: Treadmill for 20 min low intensity

4x10 Bench, overhead press, and tricep extensions

20 min Stretch

Day 2: Bike for 20 min low intensity

4 sets of whatever I can do pull ups, chin ups, and 4x10 lat pull downs

20 min Stretch

Day 3: row for 20 min low intensity

4x 10 Squats, hamstring curls, and calf raises 20 min Stretch

I was wondering if this was enough, or should I add an ab routine.