When developing muscles it's important to give them ample rest between workouts. Muscles actually "build" as they "heal" from the stress of the workout. Does the same thing apply to cardio or is it beneficial to go ahead and do a cardio workout every day or even more?

Hello! I'm a fairly big, muscular guy. I work in security. I do fairly regular weight lifting, but have been negligent in cardio. I'm 44 and would like to get back in shape, aerobically but it's so bad I'm embarrassed to jog in public. Yesterday I bought a used treadmill. This morning I spent about ...