Rung 1 of the Hacker’s Diet exercise plan consists of:

2 bends (trying to touch your toes)
3 sit ups
4 leg lifts (lying face down on the floor)
2 push ups
105 steps with 7 jumps

I wasn’t far out with my defibrillator and oxygen mask comment earlier!  The lying down exercises were fairly easy and I could probably move up to the next rung fairly easily if it was just those.  Unfortunately there are also the steps to do.  I did them, but not without my heart going at a million beats a minute (ish) and sweat pouring off me.  It just shows how unfit I am and how much there is to do.