Regularity and Simplicity go hand in hand.
A long time ago, before I even contemplated training to be a yoga teacher I practice Astanga Vinyasa yoga. I longed to be able to practice 6 days a week as the tradition prescribed but the time it took to do full Primary made it almost impossible to fit into my daily routine (without getting up at 4.30am or something equally foolish!), so it turned out that apart from my bi-weekly Astanga classes, my mat stayed in it's funky mat bag!
Over the years, with my discovery of Viniyoga and Satyananda (both of which traditions I draw inspiration from) and especially my discovery and training in Yoga Therapy, and of course becoming a teacher myself, I began to find that the more simple you kept your practice, the more regular your practice would be. I know that my 30 minute practice every morning does me far more good than struggling on my mat for 2 hours and only managing it once a week.
Once I began my daily practice I noticed that other things in my life became routines as well. For example, I get up early every morning to do my yoga practice even though I don't really have to get up as early as I do, it just feels right these days. I have also found my life becoming more simple. I no longer crave the excitement I used to and am happy here at home with my belove and my kitties!
When I work with clients on a one-to-one basis I have two pieces of advice I give them for sticking to their self practice:-
1) Keep it Simple - Don't make hugely ambitious goals for yourself that you will never keep. Let's start with 20 minutes of yoga 2 or 3 times a week.
2) However simple the goal STICK WITH IT!!!! If you don't feel like getting on your mat just do it anyway. After a few weeks you'll just step on your mat regardless.
With more routine and regularity in my life, my life has become better. All my adventures these days begin on my mat!