Part of our stewardship of these gifts is to strive for strength and health of body and mind. This makes a good place to note that if our work is strong in one dimension of exercise, we ought to discipline ourselves to exercise ourselves in the other dimension. In other words, those whose work primarily exercises their body should find ways to exercise their mind as well. And if your occupation mostly occupies your mind, then make times for exercising your body. You are steward of both mind and body.
Work builds and fortifies character.
If my job requires it, the answer is no. Work enables service. In one form or another, work empowers us to serve. And if you find yourself in an occupation that somehow doesn't seem to allow you to serve others directly, then direct a portion of your earnings to service. In addition to that, ask the Lord to show you how to serve those with whom and for whom you work.