If you are experienced yogi, I recommend this one: http://www.amazon.com/Complete-Prenatal-Vinyasa-Short-Forms/dp/ I used this one everyday during my pregnancy. The 15 min workout is a quick way to keep your body in good shape. During the weekend, when I had more time, I used the 30 min, 45 min or the 70 min workouts. The instructor is great. It's okay to start from wk 14.