"Half Dome is the ultimate Yosemite day hike - the one you can't die without doing, and the one you're most likely to die while doing."
I have started training yesterday. I don't have a lot of upper body strength and I know that I will need it to haul myself up those cables. So I bought Jillian Michael's 30 Day Shred DVD. I also need to lose 10 pounds. I tried it yesterday for the first time and it absolutely kicked my ass. I can already tell that this will be great training for Half Dome. There were lots of squats, lunges, and arm exercises with weights. I also want to start hiking on Saturdays for practice.