I'm not the OP, but my office has a similar ritual. Out of about eight people in the office, usually three to six of us go out to the patio to do pushups and so

I'm not the OP, but my office has a similar ritual. Out of about eight people in the office, usually three to six of us go out to the patio to do pushups and sometimes martial arts at about 2pm each day. Our strongest person does about 120 pushups in a row (he is really strong); the least strong does about 10; the least strong male does about 40. We try to beat our old personal records but there's not really any competition between people. We haven't experienced the problems predicted by others in this thread. It's not explicitly a team-building activity - it's just something some of us do. It's not led by a manager, and managers participate somewhat less than non-managers. It's not mandatory and if people are engrossed in a task, they choose not to join in that day.