I have heard from multiple sources including the AACC podcast that cyclists should be careful when starting running because of the mismatch between our aerobic fitness and our soft tissue.
I used to run (slowly but) frequently although only very sporadically for the last several years.
The last few times I have tried to run at what used to be a comfortable pace for what used to be a fairly easy distance. However, I keep having to shut it down about two thirds of the way there due to pain in my lateral hamstring tendon behind one knee.
Am I simply trying to run too fast and too far too soon, or is there something I can do to prevent this?