When it comes to building strength and improving fitness, there’s one critical element that too many people overlook: rest.

I've taken up running again and decided to enter a half-marathon. I know I have to push myself to get ready for the race, but I don't want to overdo it. What should I watch out for as I train?

I've taken up running again and decided to enter a half-marathon. I know I have to push myself to get ready for the race, but ...