Niyamas: Tapas

Tapas the third niyama translates as discipline or austerity, but can be better understood as "heat" or  something, the thing, that drives your practice.
The more regularly you practice, the more momentum or heat you are able to create to feed the continuation of your practice.
You practice, you begin to see results.
You practice regularly, your life begins to change.

The benefits of yoga asana practice are many--physically, mentally, emotionally--they are too numerous to list. The benefits of a meditation practice are also many--mental clarity, more level emotional state--again too numerous to create a simple list.
Despite the ability of these disciplines to heal the body, mind and spirit, there is a catch.
Isn't there always a catch?

It is this: in order to achieve the much desired benefits of practice, one must cultivate a regularity of practice. Through this regularity, we can begin to see our own weak spots, the areas of our lives on which we need to focus. If we only practice yoga asana once a week and meditate once a month, we are not exposed to the particulars of our own needs. How can we begin to listen to the focus of our thoughts--which may bring to light our personal samskaras or life patterns--if we don't sit down and do so each day?
Well, simply put, we cannot.

In this lifetime, if you wish to shed light on the true nature of your Self, if you wish to discover the fullness of life available to you (it's in there), come to the mat regularly and come to the meditation cushion even more often.

Nothing that's worth achieving comes easily. But the more consistently you practice, the more tapas you create, the more clarity you will have to see your Self as you really are.