Torso Track ab exercise is the fifth most effective exercise out of 10 in a study conducted by American Health Council. This exercise must be performed carefully or it can hurt your back. Also you need the torso track machine as shown in figure to perform this exercise. 
These are the videos that demonstrate how to do torso track exercise from youtube.
Best Six Pack Abs Training Book with lots of workout routines to get six pack abs efficiently with great meal / diet plans to cut those extra calories and get awesome six pack abs.
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