To tell you the truth, by the true definition of the word, there isn’t a REAL Power Yoga.
“Power” is the speed at which work is done on an object (Physics). This doesn’t even apply to the sport of PowerLifting. Power is not involved! If you are deadlifting 800 pounds, you are focusing on pulling that weight up, not at doing it quickly. We don’t hold a stopwatch and do a deadlift for time. That would be silly. That’s not the goal. If anything, that is closer to Olympic weightlifting. When you are lifting the bar in a clean and jerk or snatch, you pull it up quickly to get air under the bar as you drop as fast as you can under the bar. Weightlifting would be closer to “Power” lifting because there really is a speed component, though it still isn’t done for time.
The same is true with Yoga. In the classes I teach, we never forcefully move through a pose with speed. That would be both dangerous and ineffective. Yes, we do use “Strength”. You hold chaturanga or warrior 3 with a lot of strength. Arm balances and many inversions involve strength. Mayurasana and Navasana are held with strength. But “Power” is never involved. We aren’t doing any strengthening poses quickly.
If it were my choice, we would never call something Power Yoga. It is a misapplication of its meaning. Call it Strength Yoga. If its Ashtanga, just call it Ashtanga. But Power Yoga makes no sense at all
[meanwhile, I’m substitute teaching Power Yoga tomorrow, so I’ve been thinking about this]