The focus of training exercises is an observable skill. We are training the person in doing something, and it is the externally observable ability that counts. We will carry the person through gradually more challenging steps towards mastering a certain skill. We will spend more attention on actually doing it than on the reasons why one shouldn't. The idea is that if one can demonstrably do something as an exercise the ability will also become available when one needs it in life.
The focus of life tasks is specific outcomes in life. We are putting the attention outside the person, on her environment and what she needs to accomplish. We organize or expedite the accomplishment of those external tasks. We will worry less about skills and internal perceptions and will simply manipulate things into a more workable arrangement. The emphasis is on actually getting something done. This will tend to align the person's reality in the direction of getting somewhere. Facing the external situations can be rewarding and motivating.
We can switch back and forth as necessary. E.g. in doing an exercise you might find a semantic reaction that is blocking the skill being exercised. You can then switch to semantic processing and resolve the reaction. And then go back to the exercise. However, the three types are markedly different, so don't mix them up in themselves. You can switch between them, but always be clear on what you are focusing on.