Over the part of my gym regimen, my trainer and I didn’t give much importance to planks. We did achieve my goal with strength training and HIIT, though.
At the same time, another person in the gym who is not as lean as me, who is quite a bit away from their fitness goals, is able to do three planks of 53 seconds back-to-back. Because she practices them daily.
While I could barely keep still for 30 seconds.
Why are we discussing this?
Because practice matters. You will get results only in places where you have consistency in place.
And when you have been backed up by practice, you can easily achieve any (plank) goal that you know you will be proud of.