Reverse abdominal crunches are probably the simplest and most well known
of all the different crunches one can do, minor variations of the basic routine do exist.
We will concentrate on the simplest and most common of the workouts.
During this workout it is essential that the back remains flat on the floor and you use your abs to move your legs, some people choose to lay their arms flat on the floor for others they will place them behind their head either way works.
How often? How many?
Continue reading: Duration and Frequency
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Exercise Ball Crunches