The exact number of asanas recognized in yoga is not universally recognized. This is partly because there are lots of variations on certain basic postures, and a there is always the question of where you draw the line of recognizing small shifts as individual postures. Those small shifts can make enormous differences in how moving through and holding the posture effects the body, but it is possible to draw the line so fine that it becomes impossible to speak about the postures efficiently.
If you were hunting or gathering in the forest a couple of thousand years ago you would need to adopt a practice of taking great care of the plants that were poisenous, and the animals that considered you as a potential meal. While a bear or a lion is unlikely to jump on you from behind the bakery counter there are plenty of traps and poisens. The same self protective way of being is helpful when you food shop today.
Every once in a while in yoga class I will find myself saying “And there we are back to Aristotle.” When I say that it doesn't mean that I want to reference Aristotle's entire philosophical work, or even his entire ethics, but that I think yoga plays out his contention that the good is to be found in a balanced state between lack and excess. To give a really oversimplified example: self starvation is bad, and gluttony is bad, but healthy eating is good.
One of the common themes of yoga is balance (physical, mental, spiritual). One of the common themes of my teaching when I am thinking about our connection downward to the earth, and the way we lift upward with control is the strong triangle. Shavasana is one of the major postures chosen for rest because it requires little muscular tension to maintain. Cat position may be hard if one's knees are compromised, but try lifting one limb and you can feel how you begin to tighten to hold the position. Lift two and this is more difficult.
Sunday- Running or 30 minutes of cardioMonday- Yoga (60 minutes)Tuesday- Zumba or 45 minutes of cardioWednesday- Pilates (30 minutes)Thursday- Zumba or 45 minutes of cardioFriday- Yoga (60 minutes)Saturday- Rest!
Why do I have muscle tension? How can I get this to go away? Can you just massage it out? How many sessions will it take to get that out? What exercises can I do? What foods should I eat? What oils would help out with this pain?