that regularly injects some fun into your routine and keeps you coming back for more. Include a speed workout only if your goal is to run faster.When to runRunning every other day allows 'weak links' - your knees, feet, or hips - time to heal. Do slow, long runs
If your goal is simply to stay fit ad healthy, these shortyet thorough workouts will boost heart health, build bone density and strengthen muscles."Runners often think that the more they run, the healthier they'll be," says Bill Pierce, co
