If You want to have muscle abs and strong core in a short time You must try these exercises. You do 10 reps every exercises. You need have only 10 minutes on a all training. You achieve results after 4 week. These exercises are: Roll up and twist, Full crunches, Half V-tucks, Cross tucks, Reverse crunches, Windshield wipers, Scissors, 4-time abs, Flutter kicks, Plank rock.
