As a reward of their clean living and good habits these great stars have been able to withstand the rigorous test of stamina and physical exertion and have thus successfully extended their most remarkable careers over a period of many strenuous years. Major Taylor
But honestly, if you do a rigorous survey of my work, I'll bet you'll find that biology is a theme far more often than physical science. David Brin
I never had one day that I didn't want to be on the ice, because I always had an objective for that day. I had a rigorous plan and schedule in place that I had to adhere to. It was a step-by-step process of slowly but surely inching toward the Olympic Games and using every day as a series of goals to be accomplished. Apolo Ohno