Among the changes that my summer brought was a marked decrease in cycling. I still pick up my son from school by bike, but that amounts to about two miles a day. My commute to the book mines had increased to 16 miles a day before I left. A big change for a dude in his filthy forties. I was worried that I might start packing on some pounds if I didn’t do something, so I did what any geek does to solve a problem: I bought a gadget.