Hey there,
I LOVED Ab Ripper X - The first time I got through it with no breaks, I was so proud of myself. But it did get boring eventually (I could do it by memory now), so I understand why you’d like something new.
There are thousands upon thousands of ab workouts out there: tons for free & tons on DVD. I’ve tried a bunch, and very few have come close to that initial ‘burn’ from P90X (I do love the core workouts on my NTC App & X2 Core was just okay).
Body Rock TV has been adding bonus short ab-routines to their daily workouts - you can check some of them out on the site for free. But in terms of follow along, intense ab routines, you can give some of these free routines a try (they’re intense, trust me).
Pop Pilates - Intense Abs (10 minutes)
POP Pilates: Abominable Abdominals (16 minutes)
Mike Chang (a.k.a my FAVORITE shirtless wonder) also has a fabulous total body channel ‘Six Pack Shortcuts’. Fab tips & full workouts there as well.
Crazy 4 Min Ripped Core Workout
(I’m not ashamed to say, I LOVE that man).
If you do go back to Ab Ripper, add some weights/instability to the movements (holding light dumbbells for the Crunchy Frog, adding resistance bands to your bicycles or ‘heels to heaven’, using a weight for your russian twists, using a stability ball etc). You’d be amazed how intense it can get by tweaking the moves and adding difficulty.
Hope this helps!
xo