i think "motivation" is more of a factor in the beginning stages of starting ANYTHING new, whether it be a fitness routine or making sure to brush your teeth before bed every night...once you get past that beginning stage, then it becomes "habit"...once a behavior has crossed over into the "habit" phase, then far less "motivation" is required...you simply don't feel "right" when you stop performing the behavior...that's why the first few months of a diet and exercise program are always the toughest...you have to rely more on motivation, and less on the rewired neural circuitry that comes along with adopting a new pattern of behavior...and in the beginning results aren't evident, and the fact that results WILL come and you WILL reap reward and benefit from what you do takes a measure of faith...you have the assured expectation that what you want will come, although your realities are not yet beheld...it's easy to make excuses and put off things that don't generate IMMEDIATE reward, and exercise and training don't always yield IMMEDIATE benefit...in fact sometimes quite the opposite...you invest 1 or 2 hours and sometimes the only IMMEDIATE benefit is exhaustion and soreness...but we all have faith that in time the reward outweighs the sacrifice...people will always say they are "too busy"...but as the great henry thoreau once said..."the question is not are we busy, but what are we busy at?"...