If you're not a morning person, chances are you're not going to be able to wake up at 6 a.m. and complete a 40-minute yoga routine before your morning coffee. Personally, I find that after dinner I lose all motivation. So, find an hour of time that works for your schedule and your personality, and mark it on your calendar as nonnegotiable. If you can't book an entire hour, try 30 minutes twice a day, or do what I did for a while and work out in 15-minute segments.