Its not always about crunches to build solid core, you should try doing plank to strengthen your core and bring out the abs.
I know it gets really hectic after 1 hour of intense weight lifting but if you could give just 3 minutes for plank at the end, you have just accomplished your abs exercise for the day.
Set the clock to 60 seconds in your stopwatch or fit-band and do 3 sets of plank with 30 seconds of rest after each set.
Make sure that your body is in a straight line over the Yoga Mat and your hips are not moving in the upward direction.
Moreover, you should pull your stomach inside(most important part). The butterfly feeling in your stomach indicates that your plank position is perfect ;).
Keep breathing while you are in the plank position.