When we think about training for endurance events like marathons, we expect the payoff to feel good. 

We are patient with the process, yet in the progression of building fitness, we always expect that when we have a breakthrough run, it's going to feel great.

It is just not true.

When you do a run that is a lot longer, or a lot faster, you know you've made a breakthrough.

Breakthrough runs do not always feel great and that's what we're talking about today on the Doc On The Run podcast.