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RE: My Entry to the Actifit Plank Competition.
I actually heard that it is really bad to do it over a minute because it is bad for your back and that you are only supposed to do it 30 sec. but then you can do it few times which is better than long time.
I did it only for the contest, but yes my back was hurting, so that is why I did not try to do it more and try to beat the time.
For your back it doesn't matter how long you do a plank. As long as your body is in the perfect position. So you should keep your bakc/but in a straight line with the rest of your body. Or perhaps even a little bit higher.