Doubt comes from confusion. Confusion leads to paralysis when you've been injured and you don't know what to do to maintain your running fitness. 

Doctors tell you to sit still. 

Pill pushers tell you to take medicine. 

Gizmo peddlers tell you to buy expensive devices. 

Many runners don't really even know what they can do, other than rest.

If you are going to doubt anything when it comes to your running injury recovery, what you should doubt is the validity of sitting around doing nothing while waiting for healing. 

Today on the Doc On The Run podcast, we're talking about how doubt does the most damage to a recovering runner.