Is there a video on abdominal exercises? I've been piecing together different approaches trying to fine tune a routine I can use each time I'm working out. Trouble is, at the end of a 2 day routine - say chest, shoulders, triceps then 2nd day back and biceps I've run out of gas! So I've managed to work a couple of exercises - a goblet weight in a chair position and kneeling crunching with a pulley. Still sorting this out.