Have you been through bootcamp? Fortunately I was one of the last few to go through REAL navy basic back at the turn of the century, before these new-fangled barracks popped up and this new battle stations building thingamajig came out.
I also had the good fortune of being a member of the last REAL plebe summer at the US Naval Academy before they put air conditioning in Bancroft Hall (WTF?!!!).
In basic we did a little PT, a bit more marching. It was enough to get through the physical tests...especially since the policy then was that every attempt counted (talking about push-ups and sit-ups). We also got beat down by the RDCs (think drill sergeants) quite a bit. That probably helped the most.
Plebe summer was 5 days a week of 90 minutes of PT at 5 in the morning which, as a skinny, out of shape 20-something, destroyed me every time. But damned if it didn't get me in shape. Add in another 6 days of whatever sport we chose in the afternoon for a few hours and chopping all around the hallway (knees up and moving at a rapid pace) and that really helped strength and endurance.
Really, emulating the video workouts on something like the P90X routine (which quite a few formerly fatty friends swear by) would be much, much more beneficial than doing DDR for an hour.
Motivation in the situation we're talking about (basic training) is effectively provided externally, believe it or not. Those that can't deal with it should be shown the door after given a few weeks to acclimate to how much life sucks during these times...not everyone is cut out for military service, and part of boot camp is identifying those people and weeding them out. There's nothing wrong with that.
"Fifth, do you honestly believe that any of these people believe that the rest of their careers as soldiers will literally be spent playing DDR and Wii Fit? Not even the dumbest recruit would be THAT stupid, so it's a non-argument."
Yes, absolutely there are. I know and have worked with people that stupid. They tend to work the hardest and have the best attitude, though. Regardless, it is actually a fair argument to make. Seriously, not joking.
"To sum it up - you can't just go the full monty and expect it to work. You need to build people up, and that journey starts with a first step. Like it or not, that's the way reality works."
The first step of the journey is breaking them down. The arrival by bus and immediate searching of all luggage by the MAs, spending the night getting in-processed, hair buzzed, everything issued, taking a short nap sitting cross-legged on the floor with your head on your sea-bag in front of you, getting up before dawn and marching all over the place...I could go on and on. Those are immediate interruptions of your prior routine. It shocks the body and the mind and makes you pliable for a short period as well as teaching you to work with, essentially, strangers as you all cope with this new, terrible, de-spiriting new turn all your lives have taken. It provides a common low point for everyone to look back on and say "well, as terrible as things seem right now, at least I'm not back in boot camp".
Personally, I think the change would be ridiculous. But as long as new sailors are produced that'll have the mental and physical strength to literally drag me out of a burning compartment or jump in rapidly rising water to help slap on a band-it kit or whatnot, and will be able to sit at their panels and do their jobs when being chased down by a torpedo or during a jam dive or some other doomsday scenario then that's all I really care about. I don't see learning to be brave by playing DDR.