You guess you kept your lower back straight or you know you kept your lower back straight? There should be now guessing, you will feel it right away if you nailed the form or if it went out the window, at least I can. What you need is a training partner or a spotter to be watching you and telling you when your form looks bad so that you can terminate the set.



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I do situps and that is about it. I know I need more.
