Our expert says:
Very progressive bosses!
It's not unusual to experience that cumulative fatigue as the week goes on. Often this is why top athletes will do their hardest training early in the week, because that way they do it well rested and the quality is higher.
Part of what you've felt is simply that you're so early in your progress. You need to build fitness and then you'll recover much more effectively - ability to recover is one of the most important changes that happen with training, so give it another few weeks.
I think you might want to back off the intensity on the Monday though - if you're doing say 15km, you should have enough to do a couple more sessions without feeling too exhausted. If you do, then slow down on that first day.
but just give it time, it'll come!
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