In the Forum: Disproving Cardio Myths

Do you ever hear someone give fitness advice that you know is wrong? One forum member has: "I had a conversation with a friend last night...he thought I was wasting my time at the gym by going 4-5 times a week and said that all I needed to do was run outdoors as opposed to running on the treadmill (intervals) and weight training." What can he say to convince his friend that weirght training really is great for weight loss? Come join the discussion and tell us what you think.