I used to do one upper, one lower and one full body each week. That's still my main plan, but I change it up every week and am having a blast. I think I'm in the "shock your body" phase and am really liking the results. Not so much in appearance, but in actual strength. Some weeks I'll do the above, others a three-day split, others a four-day split. Some days I'll go as heavy as possible, others I'll lighten up.