How effective these exercises are is not measured by appearance; that somebody bends a lot and another looks stiff. Some people are naturally suppler than others. However, in a supple person, suppleness could be only in the partial body, not in the whole. So, let us move away from these words ‘supple’ or ‘stiff’ and respect our own unique reality. I think that, when we practise yoga exercises as bearing principle points with harmonised breath and mindfulness, everybody gets effects in a similar degree.
The video, during the first several seconds, shows important notes: Breathe through nose, Hamonise breath and movement, Flow at your own pace. I simplified these notes as much as possible in order not to make your mind busy, but these contain ‘Please do not force your body as holding breath’, that is to say, ‘Don’t do ‘push and push’ when you find your body not moving any farther against your expectation’. In this case, not all conditions may be fulfilled to move your body any father. A forcing action does not change a long-established status. Breath holding involves a conscious action and is used for a different purpose in yoga practice.
So, please let the video run by your side and practise at your breathing pace, and sometimes, visit this page to check the bearing points in each exercise, which will refine your practice.