I was a bit worried that my out-of-shape self would struggle with something like this (I'm 220 lbs and do practically no exercise), but it turns out it was all very doable. There were 2 places where it made me work for it, but overall, everything turned out far better than I thought it would. Really beautiful views and sites on the route. Tom also seems like someone who's been doing this for a while - easy to ask questions and knowledgeable about the area etc.
So, if you're fat and worried, don't be. If I can do it, you can too.