strenuous

Rangers describe the trail — a steep half-mile to reach the cave, then a half-mile loop inside — as “strenuous,” featuring possible encounters with poison oak, bees, rattlesnakes and falling rocks.

With a strenuous work and travel schedule, Ehrenreich said he felt the need for an artistic home base.

She was on a different — and one hopes less strenuous — kind of tour.

The temperature is set at a chilly 68 to 70 degrees, because body heat rises with such strenuous exertion.

It was one of the biggest moments of the postseason, one of the most strenuous moments of his career, yet he performed like a champion.