Yoga with a hint of pilates for beginners & intermediate
Dr. Beth Cholette wrote a great review & I can only add that this is set at a 1990s geographical shape professional studio with soft Enigma new age style music that keeps you going.
The two teachers take turns speaking while they workout, giving you both the English & original name for the yoga poses, one or both showing the several different levels of modifications for each exercise. I found their voices soothing, but still strong to keep you awake with good instruction, to the point, but not stiff.
I love the harder moves such as a handstand like crow being shown, but they show more emphasis on mid-level physical ability. More demanding poses such as dolphin, boat or crow/handstand are allowed stretching breaks before doing them again, but if you're more physical fit, you can hold it the entire time.
Other exercises are bicycle, cat/cow, supine knee to chest spinal twists (keeping knees up - good ab work), rolling like a ball, pilates roll-ups, 3 legged downward dog & also putting knee to chest, leg raises, etc.
I rented this at my library & so glad I took a chance.

Yoga and Pilates mix to challenge the upper body
This is an enjoyable video which targets not just the abs but the entire upper body. Two instructors, Ross Rayburn and Teigh McDonough, lead you through simple but challenging movements. Ross begins the workout with yoga sun salutations, first just focusing on breathing and forward bends, then adding in a lunge sequence.

Once you are warmed up, Ross leads you through a tougher yoga segment which is focused on the abs but which really works the arms as well. You will start in downward dog and bring your knee to your forehead, then move back to downward dog and through to plank (Teigh shows a less challenging version on hands and knees). An arm balance prep series comes next, with Ross doing the full pose and Teigh keeping her feet on the floor. This section ends with holding dolphin pose while concentrating on the abs.

Teigh leads some simple stretches and then moves on to Pilates-like floorwork. The exercises are not classic Pilates; rather, they are more like Pilates-inspired crunches. Ross also jumps in with some additional yoga poses, including boat. Finally, Teigh concludes the workout with restorative poses (reclined cobbler's and relaxation) and a brief guided meditation.

Although the workout is lead mostly by Ross, he and Teigh work well together, and Teigh frequently performs modifications. I would have preferred a bit more Pilates or other "fusion" work, but overall, I enjoyed this practice, which felt like a nice yoga routine that specifically worked my abs and arms.

Good Workout
This is a great workout for your abs. It is a little fast, but once you get the hang of it, is not bad. There are two instructors so you can follow the slower/easier instructor, or the faster/harder instructor. I think it's great!