It is said by some sources that the yogi's breathing and heart rate should not increase when practicing yoga, hence the need for prayatna sithila when practicing yoga asanas. For example, if the dynamic movements of Vinyasa yoga are slow, then the breathing rate for prayatna sithila should also be slow. According to some sources, the yogi should aim for no more than six breaths per minute.
To aid with prayatna sithila, many yogis will use ujjayi breathing, which facilitates gentle control of the breath without undue effort, when practicing asanas. They are also advised to take rest breaks whenever the breath becomes labored, forced or they lose prayatna sithila.