I'm currently doing a 4 day split as follows, but I don't really feel like I've ever worked my abs particularly hard, and I'm not really making the progress I expected.
Monday: legs
Tuesday: Chest, Triceps
Wednesday: rest
Thursday: Biceps, Back
Friday: Shoulders, Abs (2 sets decline crunch, 2 sets crunch, 2 sets leg raise)
Saturday: rest
Sunday: rest (gym is closed)
Any thoughts on doing more abs work? Apart from abs my routine is working really well, so I don't want to throw it off balance by adding in say 6 more sets with Monday's leg workout, and I've already got a busy day in the gym on Tuesday. Or do I just plug away with my existing routine?

