Hooray for fitness walking. I've got bad knees from a car accident so my main forms of exercise are fitness walking and biking. I walk a 4 mile loop at work during my lunch hour, and then do a 6 mile loop on the weekend. Average 4 days of walking a week, plus my 100 - 150 miles on the bike.

I find that the biking is great for my cardio, but the fitness walking is what takes the weight off. Plus I see great wildlife and beautiful beaches.