I think the proper core workout for me will be doing a few light sets of push-ups, sit-ups, pull-ups, and then going for a mild run daily. Along with this, I can do the T25 BeachBody workouts and then head over to the gym for a light workout using weights or take a vigorous class. To top it all off, I can do the growing taller stretches which are equivalent to doing yoga exercises to help promote my growth along with going for recovery.
With all of this in place, I also would need to cook meals. The only drawbacks I have is that I'm not always in the mood and feel tired. I think it's just a matter of pushing yourself to get there which takes time, commitment, and a positive attitude.