The manual lawn mower
Not sure if I'll continue doing this next year, but I hope so. For 2 years now I have used a manual lawn mower instead of a motorized one. The reason I got one is that, I'll get sweaty no matter if I use a motorized one or not, so why not get some real excersise out of it? And it is some work, but not that much most of the time. The only times where it is a real pain in the ass, and the results are not as good is when I don't cut the grass for a few weeks. Other than that it works perfectly.