Unless you're Pentecostal, you've probably never ran or jumped or worked up a sweat in church. But whatever your tradition, there is such a thing as churchly calisthenics. One such exercise is noted regularly in my church's worship bulletin: "Kneel as able."
In a way, it's a strange instruction—entirely unlike anything Jack LaLanne or Richard Simmons or a marine drill sergeant would exhort. Kneeling is no athletic feat, not even of a minor sort. But it's a necessary word of direction (and word of permission, since it's implicit that you don't have to kneel if you are unable).