I've worked my way all the way through all of my 1-mile walk videos twice. The first time I worked straight through the twelve different walks. The second time through, I added in the weighted balls, stretchy bands, and ab belt to increase my strength. I have most of them pictured here, but I am missing a couple of them.
Round 3 will entail adding in a few 2-mile walks, and adding a 10-minute yoga at the end. I remember a leader at the gym saying that you need to stretch for at least ten minutes after any cardio workout for maximum fat-burning. It helped before, and I won the gym contest then, so it can't hurt now.