Recommended Workouts
High Intensity Training
Core Workout
https://www.bodybuilding.com/content/the-best-ab-workout-for-a-six-pack.html
When you get to this web page you will need to scroll down to see all the exercises before you begin.
Note: Beginners are better off performing just three out of the seven exercises for two sets each of as many reps as possible, with a minute of rest between sets. From there, build up your fitness and endurance by adding exercises and sets and cutting back on your rest periods.