Yoga Sadhana is a term for a means of accomplishing something or more specifically spiritual practice. Yoga means to join/yoke/unite; the union of the individual soul with the universe and spirit.
Hatha Yoga encompasses a practice of breath work, postures and relaxation, which will strengthen, stretch and release different muscle groups. Breathing techniques will assist you in your asana practice and with your concentration. Relaxation in meditation and yoga nidra will assist with the calming of your mind and help one to obtain peace.