Some trainees want to go all out every time. Some trainees think they are going all out. They really haven’t revved up their engines as high as they think they have, but that is another matter. For those who like to go all out it is a good thing for awhile. After a time the most hardened trainee will suffer from burnout or become over-trained.
A good trainer will anticipate the burnout or the over-training and make pro-active adjustments for the trainee. Sometimes as trainers we miss the cues and have to make adjustments after the fact. I had one client who absolutely loved the workouts and trained very hard. He then became sporadic in his attendance. I asked him about it. He told me no longer looked forward to the sessions and would look for a reason to stay late at work so that he could avoid an appointment. Lesson learned; we made adjustments. We did not go hard every time after that. When we did he was really up for it.