Surrender to a higher power. Regardless of what your religions inclinations are (or aren't), Isvara pranidhana means that you should give up the illusion that you have control over everything in your life. How much time do you spend trying to control the outcome work situations, your interpersonal relationships? Wouldn't it be much more peaceful to allow situations to unfold and trust in the power that made us? Can you believe that your life is unfolding just as it was meant to regardless of how much you attempt to control, or struggle with the outcomes?
Asana Practice - Isvara pranidhana in the practice of asana reminds us that the results of our practice lie in the hands of the universe. What is more important that results, is our intention to practice and the effort that we expend on and off the mat. As Krishna tells Arjuna in the Bhagavad Gita, do not be attached to the fruits of your actions, but make every action an act of worship.
Cleanliness or purity. Saucha can mean cleanliness of the body, orderliness of the thoughts, maintaining separate energy from others, and keeping your home clean and free of clutter. When there is organization, it is easier for the mind to relax. Also, when we maintain separate space in our homes for various tasks, such as cooking, sleeping, working, practicing, it is easier for the emotions to maintain a balanced state.
Asana Practice - Saucha in the practice of asana relates to creating a separate space for your practice. This might mean dedicating a corner in a room to keep your yoga mat and props, or maybe chanting before and after you practice to mark the beginning and end of that sacred time. If you make time and space in your life to practice, but are constantly thinking of other things, you are not practicing saucha.
Contentment, acceptance of things just the way they are. I believe that samtosa is one of the most important and most difficult niyamas for the modern practitioner to grasp. We live in a world where multi-tasking and always wanting more are instilled into us at a very early age. This creates longing and suffering in the mind in almost every realm of life. Instead of following those old patterns, can you try to cultivate a sense of gratitude about what you have, who you are, and what you accomplished in your life; not in the big ways, but in small everyday ways that seem to be greatly overlooked.
Asana Practice - Samtosa in the practice of asana means that you should try to be content with what you have already attained in your practice. Every yogi or yogini has improved in some way since the beginning of their practice. Even if you have not been practicing, rather than judging yourself and wishing things were different, accept things (and yourself) as they are. This will free the mind of constantly striving and allow you to be at peace in the moment.
Perseverance, discipline, or heat. Tapas also means the ability to give yourself over to the fire of transformation. Having the discipline to practice every day builds tapas, and the ancient yogis believed that without yoga the body is like an unbaked clay pot. The fire of the kiln represents the tapas of a daily practice which bakes the body to make it strong and healthy.
Asana Practice - Tapas in the practice of asana is two-fold. First you should cultivate the determination to get on the mat and do your practice as often as possible. On the other side of that same coin, those who are too fiery and push themselves too hard, be willing to try a gentler practice. Also try using blocks or a chair to make poses accessible when you are inured or feeling tired.
Self-study, study of the ancient texts. Svadhyaya also means that we should always seek the truth, without blindly believing any one doctrine. Rather than subscribing to only one point of view, constantly look for new explanations and immerse yourself in the study of yoga. It also implies that self-observation is at the heart of the practice, notice your reactions mentally, emotionally, physically, and energetically. Notice the effects of your yoga and other practices rather than just treating them as exercise.
Asana Practice - Svadhyaya in the practice of asana means that you should become in tune to your body and feel the poses from inside. How is your breath affected by certain types of poses, how are your emotions affected by the practice of mudras. Ask yourself, “Why do I practice yoga?”
The Niyamas as outlined in Patanjali's Yoga Sutras are a guide to how the practitioner interacts with their inner world. The are not 'commandments', but a road map to navigate the complexities of our relationships with ourselves, others and the world around us in order to reduce attachments and suffering and to help you lead a conscious and aware life.