16 exercises that will give you washboard abs in no time

https://www.nhs.uk/live-well/exercise/10-minute-abs-workout/

https://builtwithscience.com/six-pack-abs-workout/

https://www.shape.com/fitness/workouts/abs-workout-secret-formula-flat-stomach

https://greatist.com/health/how-long-does-it-take-to-get-abs

https://www.poulin.healthcare/blog/91j1gc21v5dqdlt61l52n7vfm1zc4h