When you start your journey with a mentor, things might not feel as you expected.
Probably, In starting you might feel that I am not learning anything or I am not learning what I have expected to learn.
I would suggest you something, with my experience that just have patience, your mentor knows what he or she is doing.
Have faith in your choice, as you have chosen them as your mentor or guru. and just do whatsoever your mentor/guru is suggesting you to do.
If you are doubting then soon you will be off track.
For having a fit body, you are not going to start heavy lifting from the first day of your workout.
There is a lot to understand before your body is ready to lift heavy weights like Your eating habit, your diet, your mindset, and much more.
Have Faith.