An important question a coach should ask their athletes. Feedback is essential when you are training athletes for endurance events. An example: today I had a long run of 9-10 miles which I felt great even after a long bike yesterday. If you asked me that question a week ago, i would said I was very tired and struggle to finish it. I know part of it is that this week is low training but also my body is getting use to long bike one day then next day long run. Feedback helps the coach to fine tune the training load to not put the athlete into over training leading to injury but push to them to succeed in their goals. As athlete being honest to your coach makes you successful at your races.