I don't feel it requires any real strenuous regimen to stay limber and flexible.
From the desmoinesregister.com
It was just the strenuous nature of the workout, according to the investigation.
From the omaha.com
Strenuous efforts are being made to boost the cultural attractions of the coast.
From the nzherald.co.nz
Strenuous exercise for the relative years of youth may have short term benefits.
From the guardian.co.uk
Reaching the campgrounds takes a strenuous three-mile hike from the El Moro lot.
From the ocregister.com
A win could kick-start a strenuous week, which features four games in five days.
From the washingtontimes.com
You'll break a sweat and work the muscles, but nothing more strenuous than that.
From the ocregister.com
Mind you, there's nothing intellectually strenuous in the late-summer offerings.
From the time.com
As strenuous as the Tour de France is, the main action has become psychological.
From the washingtonpost.com
More examples
Characterized by or performed with much energy or force; "strenuous exercise"
Arduous: taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt
(strenuously) in a strenuous manner; strongly or vigorously; "he objected strenuously to the stand his party was taking"