Yoga for Strength isn't about just doing poses to mindlessly get stronger. It is about directing your awareness and your effort so that you can apply strength effectively with less effort.
If you put your effort in the right place, you don't have to use so much of it.
Ideas for turning balance into a general skill along with two simple exercises for learning how to balance.
Eka Pada Bakasana
the transition from Marichyasana A
controlling tension in the IT Band
(How it helps to stabilize the Hip)
(Lifting the back ribs to improve ribcage awareness and control)
For any strengthening pose the first step is to create stability somewhere within your body.
Here are some pages on Stability:
The better you are at creating stability, the easier it is to get stronger with less effort.
If you are having problems developing strength it may be due to a lack of stability somewhere within your body. Notice where you lack stability, so that you can work at creating it. Then you can get stronger with less effort.
As a yoga teacher, I'm constantly exploring new exercises, new ways of doing yoga poses.
There is no single "right way" of doing a yoga pose. Instead, there are options. And the better you are at "feeling" your body, the better you can get at choosing the right option for your body as it is now.
For any technique, the point of practice is to learn feel it and to control it, so that it can be used without thinking about how to use it.
And that is more or less the approach taken in all of my ebooks and videos. They help you to feel your body and control it so that you can work towards using it effectively in anything that you do.