This routine contains different planks, crunches, sit-ups, leg raises and at the end some really good vertical cardio ab exercises.
If you do this workout 3-4 times a week and tweak your diet a bit, you will see good results.
The videos below contains several exercises and they take 15 minutes to complete these routines.

The first routine is presented by the fitness model Ellys Angela and it lasts for about 15 minutes. In addition, it contains some exercises which are really good to burn belly fat and strengthen your cardiovascular system.

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