Should you do sit ups before you weight train or after?

Answer 1

My only recommendation is that you try BOTH. One day try them first, then another day try them after, see which one you like better, it won't really matter. Depending on the intensity of your actual lifting session, you may feel too tired to do them after, so maybe start with them first, but if you feel you still have energy left after your session, do them after.

Remember, if you want to see visible abs it won't matter how many or how often you do sit ups if you have a layer fat covering your abs. Nice abs are made in the kitchen not the gym!