A lot of it is personal preference. Bryan Kest is good. Rodney Yee and Baron Baptiste are also current names. For stretching and fitness, I’d veer more towards programs labeled “power yoga” or something similar. I’ve done Kest and Yee and I have Baptiste’s book. The Kest video from way back was very good, and the Baptiste book is too, although I haven’t officially used the book. Baptiste grew up with yoga parents and created his own style to incorporate more strength and fitness aspects.