"rigorous routine" is a perfectly correct and usable combination of words in written English and is often used to describe work or activities that are planned and highly structured.
Example: Following a rigorous routine every day helped keep me focused and productive.
Are you putting off exercise because you think you need to jump into a rigorous routine?
It surely could not have been for any strains picked up during the less than rigorous routine.
Perhaps Bush, a reformed binge drinker, and Reagan, the son of an alcoholic, each learned to view rigorous routine as a safeguard against chaos.
And while the police mobilized hundreds of officers, followed every rumor and commissioned psychiatric profiles, Mr. Metesky kept to his quiet rigorous routine in Waterbury.
Surely my new vocation, which involves dining out more than 450 times a year, would call for a more disciplined and rigorous routine.
He peppers his conversation with "Yay!" and "I love that!" Even though he keeps a rigorous routine of diet and exercise, he confessed to favoring "naughty" protein shakes.
Anyway, Kit plays war games on his computer constantly, has extremely rigorous routines around the house and is flustered – for example – if the front door bell rings more than once.
George, from Greece, who majored in accounting and finance, was our fun captain and assistant communications lead, ensuring the team had fun even when we were fatigued from following the rigorous routines and assignments.
It is no secret that her rigorous routines are already legendary.
Additionally, alternate high-impact exercise with less rigorous routines like yoga.
In retrospect, we were interested to know to what extent fibroblast period could predict sleep-wake timing, but our studies were not designed to test this hypothesis and in most cases the rigorous routines of our subjects also controlled sleep-wake.
