For a program to be most effective, Washington recommends sticking to it for at least four to five weeks before changing it ...

This is a common strength training technique that involves manipulating the muscle lengthening portion of an exercise, usually by slowing down the movement. Share on Pinterest Getty Images/Eugenio ...

Easy running, by definition, should feel easy. But as any runner knows, those long, slow runs can sometimes be the most difficult of a training program—both mentally and physically. Some good news: ...